NC0073181_Permit Issuance_20020318

b
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W ATF9
Q Michael F. Easley, Governor
'^ G William G. Ross Jr., Secretary
r North Carolina Department of Environment and Natural Resources
"f Gregory J. Thorpe, Ph.D.
mm"111111111111W Y Acting Director
y— Division of Water Quality
Nfarch 18, 2002
Mr. Quirino Q. Wong
ExxonMobil Chemical Company
2000 West Loop South, Suite 2200
Houston, Texas 77027
Subject. Issuance of NPDES Permit NCO073181
Wilmington Terminal
New Hanover County
Dear Nlr. Wong
Division of Water Quality (Division) personnel have reviewed and approved your application for renewal of the subject
permit. Accordingly, we are forwarding the attached NPDES discharge permit. This permit is issued pursuant to the
requirements of North Carolina General Statute 143-215.1 and the Nlemorandum of agreement between North Carolina and the
U.S. Environmental Protection Agency dated Nfay 9,1994 (or as subsequently amended). The following change was made to the
permit as requested in your letter of February 15, 2002:
• Footnote 2 on Section A. (1) (Effluent Limitations and Nlonitoring Requirements) was modified to specify that
flow is estimated based on the level of the lagoon before and after a discharge event.
If any pars, 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 fled 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.
Please note that this permit is not transferable except after notice to the Division. The Division may require
modification or revocation and reissuance of the permit. This permit does not affect the legal requirements to obtain other
permits which may be required by the Division of Water Quality or permits required by the Division of Land Resources, the
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 Teresa Rodriguez at telephone number [phone],
extension 595.
r
Sincerely,
Original Signed BY
David A. Goodrich
Gregory J. Thorpe
cc: Central Files
Wilmington Regional Office/Water Quality Section
NPDES Unit
Aquatic Toxicology Unit
Danny Cannon
3340 River Road
Wilmington, North Carolina 28412
N. C. Division of Water Quality I NPDES Unit Phone: [phone]
1617 Mail Service Center, Raleigh, NC 27699.1617 fax: [phone]
Internet: h2o.enr.state.nc.us DENR Customer Service Center: 1 800 623.7748

Permit NCO073181
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
11
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
(NPDES)
.4
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,
ExxonMobil Chemical Company
is hereby authorized to discharge wastewater from outfalls located at the .
South Wilmington Terminal
3340 River Road
Wilmington
New Hanover County
to receiving waters designated as an unnamed tributary to Cape Fear River in the Cape Fear River basin
in accordance with effluent limitations, monitoring requirements, and other conditions set forth in Parts
I, II, III and IV hereof.
This permit shall become effective May 1, 2002
This permit and authorization to discharge shall expire at midnight on December 31, 2006.
Signed this day March 18, 2002.
Original Signed By
David A. Goodrich
Gregory J. Thorpe, Ph.D.
Acting Director
Division of Water Quality
By Authority of the Environmental Management Commission

- a
Permit NCO073181
SUPPLEMENT TO PERMIT COVER SHEET
ExsonMobil Chemical Company
' r
is hereby authorized to:
i` 1. Continue to operate a stormwater collection and treatment system consisting of separate 20,000 and
4,000 gallon oil/water separators followed by a 2.5 acre pond located at the South Wilmington
Terminal, 3340 River Road, Wilmington, New Hanover County, and
2. Discharge treated stormwater runoff and cooling water blowdown from said treatment facility via
Outfall 001 at a specified location (see attached map) into the Cape Fear River, a waterbody
classified as SC waters within the Cape Fear River Basin.
rni

ExxonMobil Chemical Company
'
Facility Location li
State Grid/Ouad: Wilmington Latitude: 34° 10'43"N 1
_
not to scale
K 27 NW Longitude: 7g° 57' 16"
Receiving StreaCape Fear River Drainage Basin:
m:
Stream Class: Sc Sub -Basin: 03-06-17
North
NPDES Permit No. NCO073181
New Hanover County

Permit NCO073181
A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
Beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to
discharge stormwater from Outfall 001. Such discharges shall be limited and monitored by the
Permittee as specified below:
EFFLUENT
h
CHARACTERISTICS
r
LIMITS
MONITORING
REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement
Frequency
Sample
Sample Location
Flow2
Episodic
2
Effluent
Oil and Grease3
Monthly
Grab
Effluent
Total Suspended Solids
Monthly
Grab
Effluent
EPA Method 624/625
Semi-annually
Grab
Effluent
Acute Toxicity4
Annually
Grab
Effluent
Footnotes:
1. The location of the compliance monitoring sampling shall be at the effluent side of the pond.
2. Flow — During periods of no flow, the Permittee shall submit a monthly Discharge Monitoring
Report (DMR) indicating "No discharge." Flow shall be monitored with every discharge event
and shall be estimated by measuring the drop in water height in the pond from start to end of
discharge multiplied by the area of the popd and rounded to the nearest 1,000 gallons.
3. Oil and Grease — Where possible, the grab sample for oil and grease should be skimmed from
the surface of a quiescent (calm water) zone.
4. Acute Toxicity (Fathead Minnow, 24-hour), Annual [see Special Condition A.(2)].
There shall be no discharge of floating solids or foam visible 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 (or pipe) contents following hydrostatic testing unless benzene
concentration is less than 71.4 µg/l and toluene concentration is less than 11 µg/1.

Permit NCO073181
EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
SPECIAL CONDITIONS
A. (2) ACUTE TOXICITY MONITORING (ANNUAL)
The Pernfittee shall conduct annual toxicity tests using protocols defined as definitive in EPA Document
EPA/600/4-90/027 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)
t ` 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: North Carolina Division of Water Quality
Environmental Sciences Branch
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Branch 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 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.

'ermit NCO073181
A (3). BOILER BLOWDOWN
The boiler blowdown shall be rerouted to the collection pond within 180 days of the effective day of the
permit. /

Vopak Logistics North America Inc.
2000 West Loop South
Suite 2200
Houston, Texas 77027-3597
United States of America
Telephone [phone]
Fax [phone]
www.vopak.com
�' egory J. Thorpe
Actmg Director
Division of Water Quality
North Carolina Department of Environment
And Natural Resources
1617 Mail Service Center
Raleigh, NC. 17699-1617
AK11Vopak
Y, Db
FtB 1 8 2002
DIV, OF lV. tER QUAL!T'
❑ ^ -
UIiiC:J f Ih,J UFF; r�l,c
our reference e-mail Tel. Direct fax direct date
[e-mail] 713 561 7278 713 561 7322 February 15, 2002
RE: Comments on Draft Permit NCO073181
ExxonMobil South Wihnington Terminal
Dear Dr. Thorpe:
As discussed with Ms. Teresa Rodriguez of your staff, we are providing you with
comments/suggestions regarding the above -described draft permit.
On page 3, condition A.(1), Footnote 2(c), please revise to read:
(c) report flow based on measured drop of water height in the pond from start to end of
discharge multiplied by the length and the width of the pond, to the nearest 1,000
gallons.
If you have any questions or desire additional information, please call me at [phone].
Very truly yours,
0-4A:��
Quirino Q. Wong
Manager, Environmenta Affairs
On Behalf of ExxonMobil South
QQW:mun
Wilmington Terminal
Cc: Teresa Rodriguez, NCDENR, Raleigh, NC
F E B 20 20027'

AFFIDAVIT OF PUBLICATION C4 lop
f�
STATE OF NORTH CAROLINA
COirNTY OF NEW PINOVER
PUBLIC NOTICE
STATE OF
NORTH CAROLINA
ENVIRONMENTAL
MANAGEMENT
COMMISSION/NPDES UNIT
1617 Mail Service Center
Raleigh, NC 27699-1617
NOTIFICATION OF INTENT
TO ISSUE A NPDES
WASTEWATER PERMIT
On the basis of thorough
a
staff review and a plica-
tion of NC .GenerStat-
ute143.21, Public law 92-
500 and other -lawful
standards and regula-
tions, the North Carolina
Environmental Manage-
ment Commission pro-
poses to issue a National
publish date of this no-
ce.
comments re -
the proposed
will be accepted
no-
re-
Copies of the draft permit
and other supporting in-
formation on file used to
determine conditions
Present in the draft per-
mit are available upon
request and payment of
the costs of reproduction.
Mail comments:- and/or
requests for information
to the NC Division of Wa-
ter Quality at the above
address or call Ms.
Christie Jackson at (919).
733-5083. extension 538.
Please include the NPDES
permit number (attached)
In any communication.
Interested persons may
also visit the Division of
Water Quality at 512 N.
NC 27604-1148 between
the hours of 8:00 a.m.
and 5:00 p.m. to review
information on file.
2000 W. Loop
Houston, TX
applied for a
newal for a
Gated in Ne
County
wastewater
Fear River it
FearRiver I
rendy no par
portion
stream.
re-
lo-
into Cape Fear River in
the Cape Fear River Ba-
sin. Currently no parame-
ter$ are water quality
limited. This discharge
may affect future alloca-
tions in *his portion of the
receiving stream.
has
are water quali
This discharge I
future allocatio
portion of the
stream.
NPDES Permit Number
NC003794, Coming, Inc.,
310 North College Road,
Wilmington; NC 28405
has applied for a permit
renewal for a facility lo-
cated in New Hanover
County Discharging un-
treated wastewater into
Spring Branch in the
Cape Fear River Basin.
Curren*.ly no ammeters
are water quality, limited.
This discharge may affect
future allocations in this
Portion of the receiving
stream.
ti
0
Before the undersigned, a Notary Public of Said County and State,
ve
DIANE P. KEENAN
Who, being duly sworn or affirmed, according to the law, says that he/she is
CLASSIFIED ADVERTISING MANAGER
of THE WILMINGTON STAR -NEWS, INC., a corporation organized and doing business under
the Laws of the State of North Carolina, and publishing a newspaper known as WILMINGTON
MORNING STAR & SUNDAY STAR -NEWS in the City of Wilmington
PUBLIC NOTICE STATE OF NORTH CAROLINA ENVIRONMENTAL MANAGEMENT
COMMISSION/NPDES UNIT 1617 Mail Service Center Raleigh, NC 27699-1617
NOTIFICATION OF INTENT TO ISSUE A NPDES WASTEWATER PERMIT On the basis
of thorough staff review and application of NC
was inserted in the aforesaid newspaper in space, and on dates as follows:
And at the time of such publication Wilmington Star -News was a newspaper meeting all the
requirements and qualifications prescribed ky Sec. No. 1-597 G.S. of N.C.
Title: SwoCLASSIFIEDADVfMGR
rn or affirmed to, and subscribed before me this day _ � day of
A.D., Soo a
In Testimony hereof, I have her
t my hand and affixed my official seal, the day and
year aforesaid.
My commission expires J�L_ day of d1 / Q , 2onz
Notary Public
on reading the aforegoing affidavit with the advertisement thereto annexed it is adjudged by the Court that the said
was duly and properly made, and that the summons has been duly and legally served on the defendant(s).
penny renewal Tor a ta-
cility located in New
Hanover County dis-
charging wastewater into
Banks Channel in the
. Cape Fear River Basin.
Currently no parameters
are water quality, limited.
This discharged may af- 4AIL TO:
fect future allocations in
this portion of the re-
ceiving stream.
day of , _
Clerk of Superior Court

A
a:.. P I9,03432l'o
AFFIDAVIT OF PUBLICATION
STATE OFNORTH CAROLINA ✓/ �'
COUNTY OF NEW HANOVER
Before the undersigned, A Notary Public of Said Cuun[y and Sm.,
DIANE P. EEENAN
Who, being duly sworn or shimmed. according m the law, says that hdshe is
CLASSIFIED ADVERTISING MANAGER
of THE WBbiBYGTON SCAR -NEWS, INC-, a corporation org.M and doing business under -'
the Laws of the Stan, of North Carolina, and publishing a newspaper Mown At WILMINGCON
MORNING STAR & SUNDAY SCAR -NEWS in the City of Wilmington
PUBLICNOTICE STATE OF NORTH CAROLINA ENVIRONMENTAL MANAGEMENT
COMMISSIONAVFDES UNIT 1617 Mail Service Canner Raleigh, NC 27699.1617
NOTIFICATIONOFINTENT TOISSURANPDES WASTRWATRRFERMIT On Thebarb
ofabamugh.ra "AiWamdappOcadsnofNC
was insenrd in the aforesaid newspaper in apace, And on dates as follows:
11117c
And at the lime of such publication Wilungon Sur -News was a newspaper meeting A the
[equi.. end qualifications prescribed by See. of N.C.
Tiuer LTAss � 1
Sworn or affimmd to. and subscribed before nu: this
FEBRUARY .A.D.. 2002
In Testimony Whereof, I have bannui o at my hand
year aforesaid.
My commission espira 27TH day of ` M .20
Upon reading the alkneVing affidavit with the advertisement thclgo amassed it is adjudged by tha Court that the said
pubficatiou wat duly and properly made, and that the summmu has been duly and legally roved on the defe daot(s).
This day of
MA0.T0: Clerk of Superior Coup
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Draft permit reviews
Subject: Draft permit reviews
Date: Sun, 27 Jan 2002 17:38:14 -0500
From: "Matt Matthews" :[e-mail]>
To: "Teresa Rodriguez" <[e-mail]>
Teresa,
There appear to be no problems with WET implementation in the following draft permits:
NCO073181 ExxonMobil Chemical Corp. -Wilmington Terminal
NCO073172 Vopak Terminal Wilmington, Inc.
Thanks for the opportunity to comment,
Matt
Matt Matthews
NC DENR/Division of Water Quality
Aquatic Toxicology Unit
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
v-[phone]
f-[phone]
MailTo:[e-mail]
1 of 1 1/28/02 7:25 AM

SOC PRIORITY PROJECT: No
To: Permits and Engineering Unit
Water Quality Section
Attention: Teresa Rodriglz
(Review Engineer)
Date: November 15, 2001
NPDES STAFF REPORT AND RECOMMENDATION
County: New Hanover
Permit No. NCO073181
PART
I - GENERAL INFORMATION
1.
Facility and Address: Exxon Mobil Chemical Company
South Wilmington Terminal
Post Office Box 1350
3340 River Road
Wilmington, N.C. 28403
Corporate Environmental Affairs Office:
Vopak Logistics North America, Inc.
2000 W. Loop South, Suite 2200
Houston, Texas 77027
ATTN: Jim DuBose
_
iJ
0
2.
Date of Investigation: November 14, 2001
00
� N
=
3.
Report Prepared by: Jim Bushardt
4.
Person Contacted and Telephone Number:
Cannon
Donnie [phone]
5.
Directions to Site: The facility is located in
Wilmington at
3340 River Road.
6.
Discharge Point:
Latitude: 34010143/1 Longitude: 78057116/1
U.S.G.S. Quad No: K27NW USGS Quad Name: Wilmington, N.C.
7. Site size and expansion area consistent with application ?
Application does not refer to site size or expansion area.

8. Topography: The site slopes downward approximately 30 feet
toward the river and the oil/water separators are considered
to be located out of the 100 year flood plain.
9. Location of nearest dwelling: The closest dwelling is located
approximately 1/2 mile southeast of the facility.
10. Receiving stream or affected surface waters: Cape Fear River
a. Classification: Class "SC" waters
b. River Basin and Subbasin No.: 03 06 17
C. Describe receiving stream features and pertinent
downstream uses: Commercial shipping, boating,
fishing, and hunting.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. Pertinent Information
a. Volume of wastewater to be permitted: Variable,
depending on precipitation events.
b. What is the current permitted capacity of the wastewater
treatment facility? No flow limit specified.
C. Actual treatment capacity of the current facility
(current design capacity)? Unknown
d. Dates and construction activities allowed by previous
Authorizations to Construct issued in the previous two
years: No A to C's have been requested within the past
two years.
e. Please provide a description of existing or substantially
constructed wastewater treatment facilities: Gravity
oil/water separators to 2.5 acre unlined lagoon to
discharge weir and valved effluent conduit (for staged
release) .
f. Please provide a description of proposed wastewater
treatment facilities: Not applicable
g. Possible toxic impacts to surface waters: Dissolved
petroleum constituents.
h. Pretreatment Program: Not a POTW
2. Residuals handling and utilization/disposal scheme:
There is no sludge produced on the site. The floatable
product from the oil/water separator product tank and from
dock line flushing is stored within an interface tank and is
periodically sold.

3. Treatment plant classification: Class 1 chemical/physical
facility
4. SIC Code: 5171
Wastewater Code: Primary: 39 Secondary: 16, 66
Main Treatment Unit Code: 53500
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant
Funds or are any public monies involved? Not applicable
2. Special monitoring or limitations requests: None
3. Important SOC, JOC or Compliance Schedule dates: None
4. Alternative Analysis Evaluation: Has the facility evaluated
all of the non -discharge options available? Please provide
regional perspective for each option evaluated.
Spray Irrigation: Sandy soils are prevalent in the area.
Sufficient area is probably available. The site has several
petroleum contaminated groundwater plumes which could cause
problems in the monitoring activity.
Connection to Regional Sewer System: The POTW will not take
treated waste into the collection system unless the discharge
is within an environmentally sensitive area. This portion of
the river exhibits a large flow volume, contains many
discharge points, is classified as "SC" waters and is not
considered to be environmentally sensitive.
Subsurface: This option may not be feasible, due to
interference with contaminated groundwater plumes which exist.
Other Special Items: None
PART IV - EVALUATION AND RECOMMENDATIONS
This report is being prepared due to a permit renewal request.
The EXXON South Wilmington Terminal receives hydrocarbon solvents
from tanker ships. The products are stored in metal tanks of
various design and dispensed to tanker trucks. The products in the
current inventory are mainly light clear liquids and include
toluene, aromatic-100, varsol-1, exxsol D-80 (an aliphatic
hydrocarbon), exxsol D-40 (an aliphatic hydrocarbon), aromatic-100,
aromatic 150, xylene, paraxylene and isopar-M. The waste stream at
this site includes stormwater flows from containment areas
(estimated at 20.7 cfs.peak flow), and separated water from a small

pump and treat operation. Due to the current inventory of products
and type of tanks used, tank condensate drainage is not currently
performed. Terminal supply lines are flushed with water prior to
product changes and wastewater is removed to the interface tank for
future disposal.
The 2.5 acre pond does not discharge through the effluent
piping on a routine basis. The pond is located along the river and
is separated by an earthen dike. The writer assumes that the water
level within the n­lin de por4 is effected by the river and that
subsurface flow a ows percolation of water through the dike and
into the river during low tide events or during periods of high
pond levels. The river displays a high flow volume and velocity
adjacent to the pond. Ambient water quality samples of the river at
this point would probably indicated normal water quality due to the
dilution and mixing action. The pond water level was low during
the inspection and did not display a sheen on the surface. The pond
should allow volatilization of separated residuals. Groundwater
remediation activities are being performed on the site (0.144 MGD)
per Nondischarge Permit No. WQ0008129.
There are two boilers located at the facility. The boiler
treatment chemicals used at this site include Ancotreat 1300, 2000,
1240, and 1000. Ancotreat 1300 is an aqueous solution comprised of
organophosphate and synthetic polymers. Ancotreat 2000 is an
aqueous solution comprised of morpholine. Ancotreat 1240 is an
aqueous solution comprised of sodium polyphosphate and synthetic
polymers. Ancotreat is a powder comprised of catalyzed sodium
sulfite. The boiler blow -down percolated into the ground adjacent
to the boiler.
The current monitoring requirements appear to be reasonable.
These monitoring requirements are slightly different from the 2001
monitoring strategy for petroleum storage facilities. However, if
the hydrocarbon solvents at this site can be monitored in a more
simplistic and effective manner, the Region would recommend that
action.
The company's safety and environmental supervisor, Mr. Donnie
Cannon, requested a copy of the draft permit for review purposes.
His address is at the Wilmington Terminal (see Part I).
A copy of a name change request is enclosed. The company
indicated that they have submitted this information to the
Division. The request changes the name from Exxon Chemical Company
to Exxon Mobile Chemical Company.

It is recommended that NPDES Permit No. NC0073181 be prepared
and placed at public notice. If no significant adverse public
comment is received, it is recommended that NPDES permit NC0073181
be reissued to the Exxon Mobile Chemical Company -South Wilmington
Terminal in accordance with the permitting term durations of
t basinw' a per, itti g strategy.
i ature of report p eparer Date
Water Quality Regional Supervisor Date
20C>
JB:EXXON.nol
cc: Wilmington Office Files, Central Files

DENR / DWQ / NPDES Unit
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES Permit No. NCO073181
. Facility Information
Applicant/Facility Name
Exxon Mobil Chemical Co./South Wilmington Terminal
Applicant Address
3340 River Road, Wilmington, NC 28412
Facility Address
3340 River Road, Wilmington, NC 28412
Permitted Flow (MGD)
Not limited
Type of Waste
Stormwater runoff
Facility Class
N/A
County
New Hanover
Facility Status
Renewal
Regional Office
WiRO
Stream Characteristics
Receiving Stream
Cape Fear River
Stream Classification
SC
Drainage Area (sq. mi.)
Drainage basin
Cape Fear
Summer 7Q10 (cfs)
Tidal
Subbasin
03-06-17
Winter 7Q10 (cfs)
Use Support
PS
30Q2 (cfs)
303(d) Listed
Yes
Average Flow (cfs)
State Grid
K 27 NW
r1wC (%)
USGS Topo Quad
Wilmington
Summary
The South Wilmington Terminal is a bulk chemical storage facility. Among the products they
store are paraxylene, toluene, xylene, varsol, exxol and aliphatic hydrocarbon solvents. The
materials being stored can change from time to time to accommodate other needs. They
collect the stormwater from diked areas, truck loading racks and the effluent from two oil
water separators in a 2.5 acres pond. The pond has a valve for discharging into the Cape
Fear River but they do not discharge on a frequent basis. The pond is located along the
river and it is probable that water percolates from the pond to the river during low tide
periods or high pond levels.
There is a groundwater treatment system at the site, permitted under non -discharge permit
WQ0008129.
COMPLIANCE REVIEW
DMR Data Review Data was reviewed from January 1999 to August 2001. They
discharged a total of 5 times during this period. The maximum flow discharged was 1.16
MGD. TSS averaged 2.4 mg/l the highest value was 3 mg/I. - Oil and grease was detected
once at 6.3 mg/l. Benzene and toluene were below detection levels for all samples. No
reasonable potential analysis was done because the discharge is to tidal waters.
Fact Sheet
Renewal -- NPDES Permit NCO073181
Page 1

Whole Effluent Toxicity (WET) Test They passed the toxicity test for 1999 and 2000. They
did not discharge any stormwater in 2001.
Basin Plan The Cape Fear River is rated as Partly Supporting and is listed in the 303(d) list
due to low dissolved oxygen. A TMDL is being developed for this section of the river.
However, since this facility does not discharge oxygen consuming wastes this TMDL has no
effect on this permit.
PROPOSED MODIFICATIONS
• Change flow measurement frequency from monthly to episodic. All flows discharged by
the facility should be monitored.
• Eliminate Oil and Grease limit. The existing daily maximum limit is 45 mg/I. This
parameter was only detected once at 6.3 mg/I. The maximum expected concentration is
21.4 mg/I.
• Eliminate Total Suspended Solids limit. The existing daily maximum limit is 45 mg/I. The
average value for TSS was 2.4 mg/I and the highest value reported was 3 mg/I.
• Eliminate benzene and toluene limits and sampling requirements. These parameters
were not detected in any of the sampling events. Benzene, Toluene and other possible
components present in the storage tanks will be monitored through the EPA 624/625
scan.
• A special condition to reroute the boiler blowdown to the pond was added. The
blowdown is discharged directly to the ground adjacent the boiler.
PROPOSED SCHEDULE OF ISSUANCE
Draft Permit to Public Notice: January 9, 2002
Permit Scheduled to Issue: March 6, 2002
NPDES UNIT CONTACT
If you have questions regarding any of the above information or on the attached permit,
please contact Teresa Rodriguez at [phone] ext. 595.
NAME: 6,4/V DATE: 0� hz
Regional Office Comments
NAME: DATE:
NPDES SUPERVISOR: DATE:
Fact Sheet
Renewal -- NPDES NCO073181
Page 2

REASONABLE POTENTIAL ANALYSIS
Prepared by: Teresa Rodriguez,12/17/01
Facility Name =
ExxonMobil
Parameter=
Oil & Grease
NPDES # =
NC0073181
Standard =
45
N /l
Qw (MGD) =
1.16
Dataset=
DMR99
Ow cfs =
1.794752
7Q10s (cfs)=
Tidal
Modified Data
Nondetects
RESULTS
/WC (%) _
#VALUE!
6.3.
6.3
Std Dev.
1.699
2.5
<5
Mean
3.260
Chronic CCC w/s7Q10 dil.
Frequency of
Detection
2.51
<5
C.V.
0.521
Parameter
FINAL RESULTS, ug/I
#Samples
# Detects
2.51
<5
Sample#
1 5.000
Oil & Grease
2.5
<5
Max. Pred Cw
21.4
Mult Factor =
3.400
Allowable Cw
45.0
5
1
Max. Value
6.300
p A
Max. Pred Cw
21.420
pg/l
Allowable Cw
45.000
/I
Modified Data: Use 2.5 Detection Umit for non -detects

ArF9
NCDENR
i
r Y
Mr. Donnie Cannon
South Wilmington Terminal
3340 River Road
Wilmington, North Carolina 28412
Dear Mr. Cannon:
Michael F. Easley
Governor
William G. Ross, Jr., Secretary
North Carolina Department of Environment and Natural Resources
Kerr T. Stevens, Director
Division of Water Quality
July 10, 2001
Subject: NPDES Permit renewal application
Permit NC0073181
Exxon Mobil Chemical Company
New Hanover County
The NPDES Unit personnel received your permit renewal application on July 6, 2001. Thank you for
submitting the package
The permit renewal for this facility will be assigned to a member of the NPDES Unit staff. The NPDES
Unit has been working with at least 2 (and as many as 5) vacant positions since October 1998. This staff shortage is
delaying all of our permit renewals. While we do not expect severe delays in processing your permit renewal, be aware
that your permit is one of many our staff is currently reviewing.
If this staff shortage delays reissuance of NC0073181, the existing requirements in your permit will remain in
effect until the permit is renewed (or the Division takes other action). We appreciate your patience and understanding
while we operate with a severely depleted staff. If you have any additional questions concerning renewal of the
subject permit, please contact me at [phone], extension 520
r
lYco
Point Source Branch
cc: Wilmington Regional Office/Water Quality Section
NPDES Unit
N. C. Division of Water Quality / NPDES Unit Phone: [phone], extension 511 Fax: [phone]
1617 Mail Service Center, Raleigh, NC 27699-1617 DENR Customer Service Center: 1 800 623-7748
Internet: h2o.enr.state.nc.us e-mail: charles.weaverfncmail.net