WQ0008129_Final Permit_20030818

a r�RQG Michael F. Easley, Governor
William G. Ross Jr., Secretary
]North Carolina Department of Environment and Natural Resources
t., 4111�Alan W. Klimek, P.E., Director
Division of Water Quality
August 18, 2003
Mr. Mark Lewallen, SHE Major Projects Manager
Exxon Mobil Corporation,
DBA ExxonMobil Chemical Company
2800 Decker Drive
Baytown, Texas 77520
Subject: Permit No. WQ0008129 (Modification)
Exxon Mobil Corporation, DBA
ExxonMobil Chemical Company
Groundwater Remediation Facilities
New Hanover County
Dear Mr. Lewallen:
In accordance with your permit application for modification received August 8, 2003, we are
forwarding herewith Permit No. WQ0008129, dated August 18, 2003, to Exxon Mobil Corporation,
DBA ExxonMobil Chemical Company for continued operation of the subject groundwater remediation
facility. This modification makes the following changes to the permit:
1. Corrected spelling of ExxonMobil.
2. Corrected spelling of MACTEC.
3. System Description
a. Labeled UV system as "currently not operating".
b. Changed recovery well pumps to read `...pump capable of 3 gpm to 5 gpm rates
c. Changed `low pressure spray disposal trenches' to `infiltration trenches'.
4. DeIeted Item 1 under Permit Section I - Performance Standards as the AIE
certification has been received..
5. Changed Item 2 of Permit Section H - Operation and Maintenance Requirements to
read "Upon classification of the wastewater treatment and infiltration facilities ....'.
6. Permit Section IV — Groundwater Requirements Items 2a and 2b have been revised
to delete the reference to MTBE and add analytes benzene, toluene, ethylbenzeze,
and xylenes.
Non -Discharge Permitting Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
Internet http://h2o.enr.state.nc.us/ndpu
Telephone [phone] Fax [phone]
Telephone [phone]
50010 recycled/10% post -consumer paper
DENR Customer Service Center
An Equal opportunity Action Employer

7. Permit Section IV - Groundwater Requirements Item 2b has been revised to
reference analytes in Attachment 1 for EPA Method 8310. Attachment I is added to
the permit.
8. Permit Section 1V Item 4d is revised to read `The information shall be provided to
the Wilmington Regional Office verbally within 48 hours...'.
9. Permit Section IV Groundwater Requirements Item 4e regarding USTs is deleted
10. Permit Section VI General Conditions Item 1 regarding USTs is deleted.
No change is made regarding the request to add a requirement that DWQ staff take
ExxonMobil's health and safety training prior to entering the site. This is a company policy not a
requirement of the permit.
This permit shall be effective from the date of issuance until June 30, 2008, shall void Permit No.
WQ0008129 issued July 9, 2003, and shall be subject to the conditions and Iimitations as specified
therein. Please pay particular attention to the monitoring requirements in this pen -nit. Failure to
establish an adequate system for collecting and maintaining the required operational information will
result in future compliance problems.
If any parts, requirements, or limitations contained in this permit are unacceptable, you have the
right to request an adjudicatory hearing upon written request within thirty (30) days following receipt of
this permit. This request must be in the forth of a written petition, conforming to Chapter 150B of the
North Carolina General Statutes, and filed with the Office of Administrative Hearings, 6714 Mail
Service Center, Raleigh, NC 27699-6714. Unless such demands are made this permit shall be final and
binding.
If you have any questions concerning the Groundwater Conditions or groundwater monitoring
requirements, please contact Tom Cadwallader, P. E. in the Groundwater Section at [phone]. If
you need any additional information concerning this matter, please contact Bennie Goetze, Jr., P. E. at
[phone] extension 375.
i
nce
z ,
-,,,,-'Alan W. Klimek, P.E.
cc: New Hanover County Health Department
Wilmington Regional Office, Water Quality Section
Wilmington Regional Office, Groundwater Section
Groundwater Section, Central Office
Mr. Dan Shields, P. E., MACTEC Engineering and Consulting, Inc.
Technical Assistance and Certification Unit
Water Quality Central Files
NDPU Files

NORTH CAROLINA
ENVIRONMENTAL MANAGEMENT COMMISSION
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
RALEIGH
GROUNDWATER REMEDIATION PERMIT
In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as amended,
and other applicable Laws, Rules, and Regulations
PERMISSION IS HEREBY GRANTED TO
Exxon Mobil Corporation, DBA ExxonMobil Chemical Company
New Hanover County
FOR THE
operation of a 144,000 GPD (includes 100 gallon/month compressor condensate, carbon filter backwash and
infiltration gallery piping cleaning water (1000ga1 2 times per year)) groundwater remediation facility consisting
of a total of 29 recovery wells each provided with a pneumatic submersible pump capable of 3 gpm to 5 gpm
rates, a 110 gpm Puriton ultraviolet disinfection unit (currently not operating), a 1,450 gallon capacity surge tank
with chemical feed capability (bimetallic zinc metaphosphate), a 1.5 HP in -line transfer pump, two tray type 135
gpm air strippers_ (using four shallow trays each) in series each with a 900 CFM blower, a 1.5 HP in -line transfer
pump, an in -line 7.5 HP effluent pump, a 110 gpm sediment bag type filter, two 50 gpm carbon filters in parallel
at 1500 lbs of carbon each, four infiltration trenches totaling 3,825 square feet using infiltrator chambers with
high water alarm system having logic circuitry to terminate pumping operations upon high water conditions, and
all necessary and associated piping, valves, controls, and appurtenances to serve Exxon Mobil Corporation, DBA
ExxonMobil Chemical Company South Wilmington Terminal #4380 with no discharge of wastes to the surface
waters, pursuant to the application received April 1, 2003, and subsequent additional information received by the
Division, and in confomnity with the project plan, specifications, and other supporting data subsequently filed and
approved by the Department of Environment and Natural Resources and considered a part of this permit.
This permit, shall be effective from the date of issuance until June 30, 2008, shall void Permit No.
WQ0008129 issued October 14, 1998, and shall be subject to the following specified conditions and limitations:
I. PERFORMANCE STANDARDS
1. The Wilmington Regional Office, telephone number [phone], shall be notified at least forty-
eight (48) hours in advance of operation of the installed facilities so that an in -place inspection can be
made. Such notification to the regional supervisor shall be made during the normal office hours from
8:00 a.m. until 5:00 p.m. on Monday through Friday, excluding State Holidays.
2. This permit shall become voidable if the soils fail to adequately assimilate the wastes and may be
rescinded unless the facilities are installed, maintained, and operated in a manner which will protect
the assigned water quality standards of the surface waters and ground waters.

In the event that the facilities fail to perform satisfactorily, including the creation of nuisance
conditions, the Permittee shall take immediate corrective action, including those actions that may be
required by the Division of Water Quality (Division), such as the construction of additional or
replacement treatment or disposal facilities.
4. The issuance of this permit shall not relieve the Permittee of the responsibility for damages to surface
or groundwaters resulting from the operation of this facility.
5. Any residuals generated from these treatment facilities must be disposed in accordance with General
Statute 143-215.1 and in a manner approved by the Division.
6. Diversion or bypassing of the untreated groundwater from the treatment facilities is prohibited.
II. OPERATION AND MAINTENANCE REQUIREMENTS
The facilities shall be properly maintained and operated at all times.
2. Upon classification of the wastewater treatment and infiltration facilities by the Water Pollution
Control System Operators Certification Commission (WPCSOCC), the Permittee shall designate and
employ a certified operator to be in responsible charge (ORC) and one or more certified operator(s) to
be back-up ORC(s) of the facilities in accordance with 15A NCAC 8G .0201. The ORC shall visit
the facilities in accordance with 15A NCAC 8G .0204 or as specified in this permit and shall comply
with all other conditions specified in these rules.
3. The facilities shall be effectively maintained and operated as a non -discharge system to prevent the
discharge of any wastewater resulting from the operation of this facility.
III. MONITORING AND REPORTING REQUIREMENTS
Any monitoring deemed necessary by the Division to insure surface and ground water protection will
be established and an acceptable sampling reporting schedule shall be followed.
2. Noncompliance Notification:
The Permittee shall report by telephone to the Wilmington Regional Office, telephone number (910)
395-3900, as soon as possible, but in no case more than 24 hours or on the next working day
following the occurrence or first knowledge of the occurrence of any of the following:
a. Any occurrence at the groundwater remediation facility which results in the treatment of
significant amounts of contaminated groundwaters which are abnormal in quantity or
characteristic, such as the dumping of the contents of a basin or tank, the known passage of a slug
of hazardous substance through the facility, or any other unusual circumstances;
b. Any process unit failure, due to known or unknown reasons, that renders the groundwater
treatment and disposal system incapable of adequate treatment and disposal, such as mechanical
or electrical failures of pumps, aerators, compressors, etc.;
c. Any failure of a pumping station, sewer line, or treatment facility resulting in a by-pass directly to
receiving waters without treatment of all or any portion of the influent to such station or facility;
or
d. Any time that self -monitoring information indicates that the groundwater treatment and disposal
system is not in compliance with any specified permit limitations.

Occurrences outside normal business hours may also be reported to the Division's Emergency
Response personnel at telephone number [phone], or [phone]. Persons reporting such
occurrences by telephone shall also file a written report in letter form within five (5) days following
first knowledge of the occurrence. This report must outline the actions taken or proposed to be taken
to ensure that the problem does not recur.
IV. GROUNDWATER REQUIREMENTS
1. System Performance Requirements
The groundwater treatment system shall consistently achieve at least 95% removal of the influent
contaminants or 2L Groundwater Quality standards (whichever is higher) prior to discharge to the
infiltration gallery. If the treatment system fails to achieve this standard, additional treatment units or
changes in operational needs may be required.
2. Sampling Criteria
a. The effluent from the treatment system shall be sampled every month for the parameters specified
below:
EPA Method 602, benzene, toluene, ethylbenzene, and xylenes
b. Monitor wells 1*, 2, 3, 4, 5*, 7*, 22, and 23 shall be sampled every January, May, and September
for the parameters listed below.
Water level
pH
EPA Method 602, benzene, toluene, ethylbenzene, and xylenes
EPA method 8310 (See Attachment 1)
*These wells shall only be used to monitor water level.
Prior to sampling the parameters, the measurement of water levels must be taken. The
depth to water in each well shall be measured from the surveyed point on top of the casing. The
measuring points (top of well casing) of all monitoring wells shall be surveyed to a common
datum.
c. Any laboratory selected to analyze parameters must be Division of Water Quality (DWQ)
certified for the parameters required.
3. System Operation Requirements
a. The groundwater recovery, treatment and disposal system shall be inspected weekly. If it is
determined that the system is malfunctioning (i.e. not just shut down for routine maintenance), all
repairs should be made as soon as possible and reported to the Wilmington regional Office within 48
hours.
b. All components of the groundwater recovery, treatment and disposal system shall be
properly weatherproofed or the system may be shut down and piping drained, as necessary by the
permittee, to prevent freezing and failure of the system.
c. The infiltration gallery shall be operated above the water table at all times.
3

4. Reporting / Documentation
a. All reports and documentation (GW-1, GW-30, GW-59) shall be mailed to the following address:
Groundwater Section
Permits and Compliance Unit
1636 Mail Service Center
Raleigh, NC 27699-1636
Updated blank forms (GW-1, GW_30, GW-59) may be downloaded from the Groundwater
Section's website at httu://zw.ehnr.stste.nc.usl or requested from the address mentioned above.
b. The results of the sampling and analysis must be received on Form GW-59 (Groundwater Quality
Monitoring: Compliance Report Form) by the Groundwater Section at the address mentioned
above on or before the last working day of the month following the sampling month. The data
from all groundwater sampling analyses required by the permit conditions must be reported using
the most recent GW-59 form along with attached copies of the laboratory analyses.
c. The permittee shall retain records of all monitoring information, including calibration and
maintenance records, continuous monitoring data and reports required by this permit, for at least
3 years from the date of the sample measurement, report or application. Records of this
monitoring information shall include, but not be limited to, the following
i. the date, exact place, and time of sampling or measurements,
ii. the individual who performed the sampling or measurements,
iii. the date the analyses were performed,
iv. the analytical techniques or methods used, and
v. the results of such sampling, measurements, and analyses.
d. The permittee shall report any monitoring or other information which indicates:
• any contaminant may cause an endangerment to an underground source of drinking water,
• any noncompliance with a permit condition due to a malfunction of the system, or
• any cause of fluid migration outside the injection zone or area.
The information shall be provided to the Wilmington Regional Office verbally within 48 hours,
and as a written submission within five days of the occurrence. The written submission shall
contain a description of the noncompliance and its cause, the period of noncompliance, including
exact dates and times. If the noncompliance is not corrected and is expected to continue, steps
taken or planned to reduce, eliminate, and prevent reoccurrence of the noncompliance shall be
provided to the Regional Office in a timely manner.
e. Sixty (60) days prior to closure of the infiltration gallery, the permittee must request a rescission
of the permit from the Division of Water Quality.
4

5. Applicable Boundaries
a. The COMPLIANCE BOUNDARY for the disposal system is specified by regulations in 15A
NCAC 2L, Groundwater Classifications and Standards. The Compliance Boundary for the
disposal system individually permitted on or after December 30, 1983 is established at either 250
feet from the waste disposal area, or 50 feet within the property boundary, whichever is closest to
the waste disposal area. An exceedance of Groundwater Quality Standards at or beyond the
Compliance Boundary is subject to remediation action according to 15A NCAC 2L .0106(d)(2).
b. The REVIEW BOUNDARY is established around the disposal systems midway between the
Compliance Boundary and the perimeter of the waste disposal area. Any exceedance of standards
at the Review Boundary shall require action in accordance with 15A NCAC 2L .0106(d)(1).
6. Additional Requirements
Any groundwater quality monitoring, as deemed necessary by the Division, shall be provided.
V. INSPECTIONS
Adequate inspection, maintenance and cleaning shall be provided by the Permittee to insure proper
operation of the subject facilities.
2. The Permittee or his designee shall inspect the groundwater recovery and treatment facilities to
prevent malfunctions and deterioration, operator errors and discharges which may cause or lead to the
release of wastes to the environment, a threat to human health, or a nuisance. The Permittee shall
maintain an inspection log or summary including at least the date and time of inspection, observations
made, and any maintenance, repairs, or corrective actions taken by the Permittee. This log of
inspections shall be maintained by the Permittee for a period of three years from the date of the
inspection and shall be made available to the Division or other permitting authority, upon request.
3. Any duly authorized officer, employee, or representative of the Division may, upon presentation of
credentials, enter and inspect any property, premises or place on or related to the disposal site or
facility at any reasonable time for the purpose of determining compliance with this permit, may
inspect or copy any records that must be maintained under the terms and conditions of this permit,
and may obtain samples of groundwater, surface water, or leachate.
VI. GENERAL CONDITIONS
This permit shall become voidable unless the facilities are constructed in accordance with the
conditions of this permit, the approved plans and specifications, and other supporting data.
2. This permit is effective only with respect to the nature and volume of wastes described in the
application and other supporting data.
3. This permit is not transferable. In the event there is a desire for the facilities to change ownership, or
there is a name change of the Permittee, a formal permit request must be submitted to the Division
accompanied by an application fee, documentation from the parties involved, and other supporting
materials as may be appropriate. The approval of this request will be considered on its merits and
may or may not be approved.
4. A set of approved plans and specifications for the subject project must be retained by the Permittee
for the life of this project.

Failure to abide by the conditions and limitations contained in this permit may subject the Permittee
to an enforcement action by the Division in accordance with North Carolina General Statute 143-
215.6A to 143-215.6C.
The annual administering and compliance fee must be paid by the Permittee within thirty (30) days
after being billed by the Division. Failure to pay the fee accordingly may cause the Division to
initiate action to revoke this permit as specified by 15A NCAC 2H .0205 (c)(4).
The issuance of this permit does not preclude the Permittee from complying with any and all statutes,
rules, regulations, or ordinances which may be imposed by other government agencies (local, state,
and federal) which have jurisdiction.
8. The Permittee, at least six (6) months prior to the expiration of this permit, shall request its extension.
Upon receipt of the request, the Commission will review the adequacy of the facilities described
therein, and if warranted, will extend the pern-a t for such period of time and under such conditions
and limitations as it may deem appropriate.
Permit issued this the 181n day of August, 2003
NORTH AROLINA NVIRONMENTAL MANAGEMENT COMMISSION
Alan W. Klimek, P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission
Permit Number WQ0008129
0

ATTACHMENT NO. 1
PERMIT NO_ WQ0008129
SEMI-VOLITILE COMPOUNDS
EXXON/MOBIL CHEMICAL COMPANY TERMINAL #4380 — WILMINGTON, NORTH CAROLINA
EPA METHOD 8310
Polynuclear Aromatic Hydrocarbons
Acenaphthene
Acenaphthylene
Anthracene
Benzo(a)anthracene
Benzo(b)fluoranthene
B enzo(k) #7u oranthene
Benzo(g,h,i)perylene
Benzo(a)pyrene
Chrysene
Dibenzo(a,h)anthracene
Fluoranthene
Fluorene
Indeno(1,2,3-cd)pyrene
Naphthalene
Phenanthrene
Pyrene