WQ0012345_Final Permit_19960710

:state of North Carolina
Department of Environment,
Health and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P. E., Director
July 10, 1996
Mr. J. Frank Medlin, Senior Staff Engineer
Exxon Company, U.S.A.
Post Office Box 30451
Charlotte, North Carolina 28230
Dear Mr. Medlin:
I DEHNF-:1
Subject: Permit No. WQ0012345
Exxon Company, U.S.A.
Exxon RAS 4-5480
Greensboro, N.C.
4408 Groometown Road
Groundwater Remediation Facilities
Guilford County
In accordance with your application received April 26, 1996, we are forwarding herewith Permit
No. WQ0012345 dated July 10, 1996, to Exxon Company, U.S.A. for the construction and operation of
the subject groundwater remediation infiltration gallery facilities; and the continued operation of the subject
existing groundwater remediation treatment facilities. It is understood the permittee is converting the
existing groundwater remediation discharge facilities (NPDES Permit No. NC0084522) to an infiltration
gallery system.
This permit shall be effective from the date of issuance until June 30, 2001, and shall be subject to
the conditions and limitations as specified therein. Please pay particular attention to the monitoring
requirements in this permit. 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 form of a written petition, conforming to Chapter 150B of the
North Carolina General Statutes, and filed with the Office of Administrative Hearings, P.O. Drawer
27447, Raleigh, NC 27611-7447. Unless such demands are made this permit shall be final and binding.
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper

One set of approved plans and specifications is being forwarded to you. If you have any questions
concerning the Groundwater Conditions or groundwater monitoring requirements, please contact Mr.
David Goodrich in the Groundwater Section at 9191715-6162 If you need any additional information
concerning this matter, please contact Mr. Sohn Seymour
.,at [phone] extension 546.
Sincerely,
A. Prest Howard, Jr., P.E.
cc: Guilford County Health Department
Haggett Engineering Associates, Inc.
Winston-Salem Regional Office, Water Quality Section
Winston-Salem Regional Office, Groundwater Section
Bob Cheek, Groundwater Section, Central Office
Training and Certification Unit
Facilities Assessment Unit

NORTH CAROLINA
ENVIRONMENTAL MANAGEMENT COMMISSION
DEPARTMENT OF ENVIRONMENT, HEALTH 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 Company, U.S.A.
Guilford County
FOR THE
construction and operation of a 7,200 GPD groundwater remediation facility, using existing groundwater
remediation treatment facilities (originally authorized under permit No. NC0084522), consisting of 5
recovery wells using vacuum pumps, a 108 cfm capacity vacuum pump blower system, a CPS-5 oil/water
separator, a chemical feed system to minimize iron fouling, a surge tank with transfer pump, a 20 gpm 6
tray air stripper with transfer pump, a 25 gpm BFN-12-2 prefilter, a 10 gpm LCI-1 S UV disinfection unit,
a 25 gpm BFN-12-2 post filter, dual 10 gpm carbon cells in series, dual 50 ft. by 3 ft. by 4 feet deep
infiltration galleries with two high water level sensors, and all associated piping, valves, controls, and
appurtenances to serve Exxon Company, U.S.A.'s Exxon RAS 4-5480 at 4408 Groometown Road in
Greensboro, N.C., with no discharge of wastes to the surface waters, pursuant to the application received
April 26, 1996, and in conformity with the project plan, specifications, and other supporting data
subsequently filed and approved by the Department of Environment, Health and Natural Resources and
considered a part of this permit.
This permit shall be effective from the date of issuance until June 30, 2001, and shall be subject to
the following specified conditions and limitations:
I. PERFORMANCE STANDARDS
1. Upon completion of construction and prior to operation of this permitted facility, a
certification must be received from a professional engineer certifying that the permitted
facility has been installed in accordance with this permit, the approved plans and
specifications, and other supporting materials. Mail the Certification to the Water Quality
Permits and Engineering Unit, P.O. Box 29535, Raleigh, NC 27626-0535.
2. The Winston-Salem Regional Office, telephone number 910/ 771-4600 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.
3. 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.
4. 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 this Division, such as the construction of additional or
replacement treatment or disposal facilities.

5 . 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.
6. Any residuals generated from these treatment facilities must be disposed in accordance with
General Statute 143-215.I and in a manner approved by the North Carolina Division of
Water Quality.
Diversion or bypassing of the untreated groundwater from the treatment facilities is
prohibited.
II. OPERATION AND MAINTENANCE REQUIREMENTS
1. The facilities shall be properly maintained and operated at all times.
2. Upon classification of the facility by the Certification Commission, the Permittee shall
employ a certified wastewater treatment plant operator to be in responsible charge (ORC) of
the wastewater treatment facilities. The operator must hold a certificate of the type and
grade at least equivalent to or greater than the classification assigned to the wastewater
treatment facilities by the Certification Commission. The Permittee must also employ a
certified back-up operator of the appropriate type and grade to comply with the conditions
of Title 15A, Chapter 8A, .0202. The ORC of the facility must visit each Class I facility at
least weekly and each Class I1,1I1, and IV facility at least daily, excluding weekends and
holidays, and must properly manage and document daily operation and maintenance of the
facility and must comply with all other conditions of Title 15A, Chapter 8A, .0202. Once
the facility is classified, the Permittee must submit a letter to the Certification Commission
which designates the operator in responsible charge within thirty days after the wastewater
treatment facilities are 50% complete.
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
1. Any monitoring deemed necessary by the Division of Water Quality 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 Winston-Salem Regional Office, telephone
number 910/ 771-4600 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.
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.
I V . GROUNDWATER REQUIREMENTS
The groundwater treatment system shall consistently achieve Class GA Groundwater
Standards in the treated effluent, as outlined under Title 15A, Subchapter 2L, Section
.0202(g), prior to discharge to the infiltration gallery. The treated water discharged into the
infiltration gallery must not violate the Class GA Groundwater Quality Standards for any
constituent beyond the compliance Boundary, nor cause the migration of contamination into
unaffected areas. If the treatment system fails to consistently achieve these standards,
additional treatment units or changes in operational methods may be required.
2. Monitor wells MWA, MW-4, MW-6, MW-8, MW-9, MW-10, and MW-12 shall be
sampled prior to waste disposal operations in the infiltration galleries and thereafter every
March, June, September, and December for the following parameters:
Toluene
MTBE
Benzene
Ethylbenzene
pH
Water Level
Xylenes
Naphthalene
EDB
Lead
1PE
The analysis for hydrocarbon compounds are to be performed by Standard Method 6210D.
The measurement of water levels must be made. prior to sampling for the remaining
parameters. The depth to water in each well shall be measured from the surveyed point on
the top of the casing.
The measuring points (top of well casing) of all monitoring wells shall be surveyed to
provide the relative elevation of the measuring point for each monitoring well.
The results of the sampling and analysis must be received on Form GW-59 (Groundwater
Quality Monitoring: Compliance Report Form) by the Groundwater Section, Permits and
Compliance Unit, P.O. Box 29578 Raleigh, N.C. 27626-0578 on or before the last
working day of the month following the sampling month.
3. Pumping water levels will be measured in the five recovery wells during the quarterly
sampling events, and this information will be recorded and kept at the site.
4. A 4 inch diameter water -level monitoring observation well shall be constructed as part of
the infiltration gallery at the location of and as a conduit for one of the two gallery high
water level sensors. The well shall be labeled P-1 and will comply with the regulations set
forth in 15A NCAC 2C .0108 (Standards for Construction of Wells Other than Water
Supply) and any other State or local laws and regulations.
5. The two (2) infiltration gallery high water sensors shall be set to shut down the remediation
system when the water level in the infiltration gallery rises to within one (1) vertical foot of
the distribution line. The shutoff system will be designed such that the remediation system
will remain off until the water level in the well P-1 or the infiltration trench falls to an
elevation of at least two (2) vertical feet below the distribution line.

6. The Winston-Salem Regional Office groundwater supervisor, telephone number 910/ 771-
4600 shall be notified at least forty-eight (48) hours prior to the construction of monitoring
well P-1 so that an inspection can be made of the monitoring well location. Such
notification to the regional groundwater 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.
7. The water level in the P- I montoring well shall be measured at least once every day for the
duration of the permit, and this information will be provided to the regional groundwater
supervisor at the Winston-Salem Regional Office. The remediation system will be equipped
with an electronic monitor which automatically records the time and date of every system
shutdown event. If more than three (3) high-water activated shutdown events are recorded
during a consecutive 30-day period, the system flow rate will be reduced by 10% of its rate
at that time. If the situation persists after the flow rate has been reduced, further reductions
in the flow rate may be required.
8. The system will initially perform at a pumping rate not to exceed 2.5 gallons per minute.
This rate will be maintained for sixty (60) days and the daily water level readings in the
water -level monitoring well, along with a record of float -activated system shutdown
events, will be submitted to the regional groundwater supervisor at the Winston-Salem
Regional Office on a weekly basis during that time.
9. Within sixty (60) days of completion of monitoring well P-1 and the five (5) recovery
wells, the permittee shall submit two original copies of a scaled topographic map (scale no
greater than 1":100') signed and sealed by a professional engineer or a state licensed land
surveyor that indicates all of the following information:
a. the location and identity of each monitoring well,
b . the location of the waste disposal system,
c. the location of all property boundaries,
d . the latitude and longitude of the established horizontal control monument,
e. the relative elevation of the top of the well casing (which shall be known as the
"measuring point"), and
f. the depth of water below the measuring point at the time the measuring point is
established.
The survey shall be conducted using approved practices outlined in North Carolina General
Statutes Chapter 89C and the North Carolina Administrative Code Title 21, Chapter 56.
The surveyor shall establish a horizontal control monument on the property of the waste
disposal system and determine the latitude and longitude of this horizontal control
monument to a horizontal positional accuracy of +/- 10 feet. All other features listed in a.
through e. above shall be surveyed relative to this horizontal control monument. The
positional accuracy of features listed in a. through e. above shall have a ratio of precision
not to exceed an error of closure of I foot per 10,000 feet of perimeter of the survey. Any
features located by the radial method will be located from a minimum of two points.
Horizontal control monument shall be installed in such a manner and made of such
materials that the monument will not be destroyed due to activities that may take place on
the property. The map shall also be surveyed using the North American Datum of 1983
coordinate system and shall indicate the datum on the map. All bearings or azimuths shall
be based on either the true or NAD 83 grid meridian. If a Global Positioning System
(GPS) is used to determine the latitude and longitude of the horizontal control monument, a
GPS receiver that has the capability to perform differential GPS shall be used and all data
collected by the GPS receiver will be differentially corrected.
The maps and any supporting documentation shall be sent to the Groundwater Section,
N.C. Division of Water Quality P.O. Box 29578 Raleigh, N.C. 27626-0578.
4

14. The influent and effluent from the treatment system shall be sampled once every two (2)
weeks for the first three (3) months and monthly thereafter for the parameters specified
below:
BTEX (by EPA Method 602)
MTBE (by EPA Method 602)
Naphthalene (by EPA Method 610)
One cope of the results of the sampling and analysis must be received by the Groundwater
Section, Permits and Compliance Unit, P.O. Box 29578 Raleigh, N.C. 27626-0578 and
one copy shall be sent to the Winston-Salem Regional Office, address 8025 North Point
Boulevard, Winston-Salem, N.C. 27106, on or before the last working day of the month
following the sampling event.
11. Isoconcentration (lines connecting points of equal concentration) maps in both the vertical
and horizontal directions shall be developed using the September groundwater monitoring
data for Benzene. A water level contour map must also be developed on a annual basis
using the September data. Two copies of these maps shall be submitted along with all
other monitoring data for that period, to the Groundwater Section, N.C. Division of Water
Quality P.O. Box 29578 Raleigh, N.C. 27626-0578.
12. The permittee shall retain copies of records of all monitoring information, including all
calibration and maintenance records, all original strip chart recordings for continuous
monitoring instrumentation and copies of all reports required by this permit, for a period of
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:
a. the date, exact place, and time of sampling or measurements,
b . the individual who performed the sampling or measurements,
c. the date the analyses were performed,
d. the analytical techniques or methods used, and
e. the results of any such sampling, measurements, and analyses.
13. The permittee shall submit a report outlining the injection volumes and pressures of the
injection wells. This report may be submitted along with all other monitoring data.
14. The permittee shall report any monitoring or other information which indicates that any
contaminant may cause an endangerment to an underground source of drinking water and
any noncompliance with a permit condition of malfunction of the injection system which
may cause fluid migration outside the injection zone or area. The information shall be
provided to the Winston-Salem Regional Office orally within 8 hours of the occurrence 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, and if the noncompliance has not been corrected, the
anticipated time it is expected to continue, and any steps taken or planned to reduce,
eliminate and prevent reoccurrence of the noncompliance.
15. Upon completion of all well construction activities, a certification must be received from a
professional engineer certifying that the monitoring wells are located and constructed in
accordance with the Well Construction Standards (15A NCAC 2C) and this permit. This
certification should be submitted with copies of the Well Completion Form (GW-1) for
each well. Mail this certification and the associated GW-1 forms to the Permits and
Compliance Unit, Groundwater Section, P.O. Box 29578, Raleigh, NC, 27626-0578.
16. All components of the groundwater recovery, treatment, and disposal system shall be
properly weather -proofed to prevent freezing and failure of the system.

17. The COMPLIANCE BOUNDARY for the disposal system is specified by regulations in
15A NCAC 2L, Groundwater Classifications and Standards. The Compliance Boundary is
for the disposal system constructed after December 31, 1983 is established at either (1) 250
feet from the waste disposal area, or (2) 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 immediate remediation action in addition to
the penalty provisions applicable under General Statute 143-215.6A(a)(1).
In accordance with 15A NCAC 2L, a REVIEW BOUNDARY is established around the
disposal systems midway between the Compliance Boundary and the perimeter of the
waste disposal area. Any exeeedance of standards at the Review Boundary shall require
remediation action on the part of the permittee.
18. Any additional groundwater quality monitoring, as deemed necessary by the Division, shall
be provided.
V . INSPECTIONS
1. 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 of Water Quality or other permitting authority, upon request.
3. Any duly authorized officer, employee, or representative of the Division of Water Quality
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
1. Issuance of this permit does not constitute approval for reimbursement from the Leaking
Petroleum Underground Storage Tank CIeanup Funds (15A NCAC 2P).
2. 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.
3. This permit is effective only with respect to the nature and volume of wastes described in
the application and other supporting data.
4. 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 of Water Quality 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.
5. A set of approved plans and specifications for the subject project must be retained by the
Pern-ittee for the life of this project.
b

6. Failure to abide by the conditions and limitations contained in this permit may subject the
Permittee to an enforcement action by the Division of Water Quality in accordance with
North Carolina General Statute 143-215.6(a) to 143-215.6(c).
7. 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).
8. 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.
9. 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 permit for such period of time
and under such conditions and limitations as it may deem appropriate.
Permit issued this the 1 Oth day of July, 1996
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
A. Preston ward, Jr., P.E.)Director
Division of Water Quality
By Authority of the Environmental Management Commission
Permit Number WQ0012345

Permit No. W Q0012345
July 10, 1995
ENGINEER'S_CERTIEICATIQN
I, , as a duly registered Professional Engineer in the State of North
Carolina, having been authorized to observe (periodically, weekly, full time) the construction of the
project, ,
Project Nanze
Location
for the
Permittee hereby state that, to the best of my abilities, due care and diligence was used in the observation
of the construction such that the construction was observed to be built within substantial compliance and
intent of this permit, the approved plans and specifications, and other supporting materials.
Signature
Date
Registration No.

36"
"80
GN SCALE EH FEET
0 1000 2000 4000 6000
48M1LS 0'4f X
12 M S HACCETT ENCIIIEERINC ASSOCIATES. IAA
5849 SJUTS COLLEGE ROAD
IF a irmkaNcrox NORTH c lROLTNA 28412
PHON- (9to) 397-0608
UTW GRID AND 19W MA.GNET1C NORTH
DECLNATi0N AT CE24T R OF SHEET 5,
EXXON COMPANY, U.S.A.
LOCATION 4-5480
4408 GROOMETOWN ROAD
GREENSBORO, NORTH CAROLINA
TOPOGRAPHIC LOCATION MAP FOR
INFILTRATION GALLERY PERMIT
FIGURE 1
EXXON RAS 4-5480
GROUNDWATER REMEDIATION SYSTEM
GUILFORD COUNTY
WQ00123451GW96081
SITE LOCATION MAP
REFERENCES: U.S_G_S_ PLEASANT GARDEN, N.C.

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N EXXON COMPANY, USA
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LOCATION 4-
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WILMINCTON, NORTH CAROLINA 28412 GR4408 GRpONORTH
ROAD
Ji I; EENSBORO, NORTH CAROLINA
PHONE: [phone],908 GROUNDWATER REINFILTRATION GALLERY
- PROPOSED LAYOUT
S REFERENCES: SURVEY BY ALIEN & ASSOCIATES, AND PS
LEGEND
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PROPERTY LINE
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NOTE:
THE PROPERTY LINE SHOWN IS BASED ON THE
DEED RECORDED IN BOOK 3490 PAGE 1770.
GRAPHIC SCALE
III 0 20 40 e0
(IN FEM
I inch - 40 fc t
FIGURE 2
EXXON RAS 4-5480
GROUNDWATER REMEDIATION SYSTEM
GUILFORD COUNTY
WQ00123451GW96081
SITE DETAIL MAP

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1 .Sinale-tamby di&dwging "orna, with the axaeptian of Itarobtc TreArn t Lk*s, rdri be alsss1W 9 pvmtmsd after July 1,
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aystsrrta wal be notified of stye clash etion w mde"Fa 6w by Vvo Cormisaian4 In wrIl tp.
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