NCG510203_Complete File_19970811

State of North Carolina O�
Department of Environment,
Health and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
A. Preston Howard, Jr., P.E., Director
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1:3FEE HNF1
August 11,1997
Mr. Michael Parrott
Piedmont Natural Gas Company / l %
P.O. Box 33068 e SC�n r /G�
Charlotte, North Carolina 28233 111///
Subject: Permit Error Correction
former Service Operation Center
Certificate of Coverage NCG510203
Guilford County
Dear Mr. Parrott:
The Division issued the renewed permit for this site on April 25, 1997. Your letter of August 8, 1997
reported that the address information submitted with your renewal fee was incorrect. Your letter contained
the correct site address and requested that we correct our records accordingly. Enclosed you will find a revised
Certificate of Coverage for the subject facility. Insert the corrected Certificate into your permit and discard
the one issued previously.
This Certificate of Coverage 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. If any parts, measurement frequencies or sampling requirements contained in
this permit are unacceptable to you, you have the right to request an individual permit by submitting an
individual permit application. Unless such demand is made, this Certificate of Coverage shall be final and
binding.
The Certificate of Coverage is not transferable except after notice to the Division. Use the enclosed
Permit Name/Ownership Change form to notify the Division if you sell or otherwise transfer ownserhip of
the subject facility. The Division may require modification or revocation and reissuance of the Certificate of
Coverage. If your facility ceases discharge of wastewater before the expiration date of this permit, contact
the Winston-Salem Regional Office. Once discharge from your facility has ceased, this permit may be
rescinded.
This permit does not affect the legal requirements to obtain other permits which may be required by
the Division of Water Quality, 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 Charles Weaver at telephone number [phone], extension 511.
cc: Central Files
Mooresville Regional Office
Winston-Salem Regional Office
Permits and Engineering Unit
Facility Assessment Unit
Sincerely,
Id
reston Howard, Jr.,E.
P.O. Box 29535, Raleigh, North Carolina 27626-0535
An Equal Opportunity Affirmative Action Employer
Telephone [phone] FAX [phone]
50% recycled / 10% post -consumer paper

STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT, HEALTH, AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
GENERAL PERMIT NO. NCG510000
CERTIFICATE OF COVERAGE NO. NCG510203
TO DISCHARGE PETROLEUM -CONTAMINATED GROUNDWATER AND
SIMILAR WASTEWATERS 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,
Piedmont Natural Gas Company
is hereby authorized to discharge treated wastewater from a groundwater remediation system
from a facility located at
former Service Operation Center
1029 Winston Street
Greensboro
Guilford County
to receiving waters designated as subbasin 30602 in the Cape Fear River Basin
in accordance with the effluent limitations, monitoring requirements, and other conditions set forth
in Parts I, II, III and IV of General Permit No. NCG510000 as attached.
This certificate of coverage shall become effective August 11, 1997.
This certificate of coverage shall remain in effect for the duration of the General Permit.
Signed this day August 11,1997.
�A. Preston Howard,"Jr., P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission

Piedmont
NaturaiGas
Company
Post Office Box 33068
Charlotte, North Carolina 28233
August 8, 1997
Mr. Charles H. Weaver, Jr
Division of Water Quality/WQ Section
NPDES Group
P. 0. Box 29535
Raleigh, NC 27626-0535
RE: RENEWAL of NPDES Peiinit NC3510203
In December of 1996 1 received an Invoice for Renewal of NPDES Permit
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NCG510203, Mecklenburg County. When I could not locate a discharge permit for
Mecklenburg County in my files, I talked with Randy Jones of your office on
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December 19, 1996 and Mike Parker in the Mooresville Regional Office on January 7,
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1997, they both assured me the permit was valid and should be renewed. I renewed
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the permit on March 31, 1997. 1 returned the Invoice with a check for $400.00, and
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corrected the facility location to the Charlotte address based on my conversations
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with Randy and Mike. I received a letter dated April 25, 1997 with information
renewing this permit for Mecklenburg County.
While preparing for a tank inspection in Guilford County on July 29, 1 found General
Permit NCG510000, Cert. Of Coverage NCG510203, Piedmont Natural Gas
Company, Former Service Operation Center, Greensboro, Guilford County. This
permit should be for Guilford County, not Mecklenburg.
Please correct your records and the Mooresville and Winston-Salem Regional Office's
records to show that this permit is for Guilford County, not Mecklenburg.
Facility Location should be: Piedmont Natural Gas Company
Former Service Operation Center
1029 Wuiston soeet
Greensboro, NC
Guilford County ID # 0-009657
If you have any questions you may contact me at 704-364-31 20.
Yours truly,
1 C /Y(
Michael N. Parrott
Superintendent -Maintenance

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
April 25, 1997
MIKE PARROTT
PIEDMONT NATURAL GAS CO
P.O. Box 33068
Charlotte, NC 28233
Subject: Renewal of NPDES Permit No. NCG510203
Mecklenburg County
Dear Permittee:
4
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EDIFEE HNF1
In accordance with your application for permit renewal, the Division is forwarding the subject NPDES general
permit for petroleum contaminated groundwater remediation systems. This General 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 and as subsequently amended.
The Certificate of Coverage previously issued to your facility is now valid under the revised General Permit for
discharges associated with groundwater remediation systems (NCG510000 - issued August 22,1996). The new General
Permit is more comprehensive, in that it covers remediation of groundwater contaminated with heavier fuels (such as
diesel, fuel oil, and kerosene) as well as gasoline contamination. Please note that the permit has three effluent
limitations pages. The type of contamination at your site (gasoline only, heavy fuels only, or gasoline and heavy
fuels) will determine the effluent limitations for your discharge.
If any parts, measurement frequencies or sampling requirements contained in this permit are unacceptable to you, you
have the right to request an individual permit by submitting an individual permit application. Please take notice
that the previously issued Certificate of Coverage is not transferable except after notice to the Division of Water
Quality. The Division of Water Quality may require modification or revocation and reissuance of the Certificate of
Coverage.
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 Division of Coastal Management, or any
other Federal or Local governmental permit that may be required.
If you have any questions or need additional information, please contact Charles Weaver at telephone number (919)
733-5083, extension 511.
Resp ctfull
/ uVII
A. Preston Howard, Jr., P.E.
cc: Central Files
Mooresville Regional Office
Permits & Engineering Unit
Facility Assessment Unit

State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Environmental Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
Mr. Mike Parrot
Piedmont Natural Gas Company
PO Box 33068
Charlotte, NC 28233
Dear Mr. Parrott:
[D E 1--1 N F=1
September 9, 1994
Subject: General Permit NCG510000
Cert. of Coverage NCG510203
Piedmont Natural Gas Company
Former Service Operation Center
Greensboro
Guilford County
In accordance with your application for an NPDES discharge permit received April 5 ,1994 by the
Division, we are herewith forwarding the subject Certificate of Coverage under the state-NPDES general
permit for a groundwater remediation system consisting of a recovery well and recovery trench, an
oil/water separator, low profile air stripper, sediment filter and carbon filtration and one set of final
approved plans and specifications. A variance is granted from the minimum setback requirement of 50 feet
from the north property line due to the location of monitoring wells on the site. The treatment compound
shall be set back as far from the north property line as feasible. Authorization is hereby granted for the
construction and operation of a groundwater remediation system with discharge of treated wastewater into
an unnamed tributary to Muddy Creek. This Certificate of Coverage is issued pursuant to the requirements
of North Carolina and the US Environmental Protection Agency Memorandum of Agreement dated
December 6, 1983 and as subsequently amended.
If any parts, measurement frequencies or sampling requirements contained in this general permit
are unacceptable to you, you have the right to submit an individual permit application and letter requesting
coverage under an individual permit. Unless such demand is made, this decision shall be final and
binding. Please take notice this permit is not transferable. Part 11, E.4. addresses the requirements to be
followed in case of change of ownership or control of this discharge.
The Authorization to Construct is issued in accordance with Part III, Paragraph 2 of NPDES
Permit No. NCG510000, and shall be subject to revocation unless the wastewater treatment facilities are
constructed in accordance' with the conditions and limitations specified in Permit No. NCG510000.
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 as may be required by this
Division, such as the construction of additional or replacement wastewater treatment or disposal facilities.
The Winston-Salem Regional Office, telephone number 910/896-7007, 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
Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper

Permit No. NCG510000
Authorization to Construct
Piedmont Natural Gas Company
September 9, 1994
Page 2
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.
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 the NPDES Permit, the Certificate of Coverage, this Authorization to Construct and the
approved plans and specifications. Mail the Certification to the Permits and Engineering Unit, P.O. Box
29535, Raleigh, NC 27626-0535.
A copy of the approved plans and specifications shall be maintained on file by the Permittee for the
life of the facility.
Failure to abide by the requirements contained in this Authorization to Construct may subject the
Permittee to an enforcement action by the Division of Environmental Management in accordance with
North Carolina General Statute 143-215.6A to 143-215.6C.
The issuance of this permit does not preclude the Permittee from complying with any and all
statutes, rules, regulations, or ordinances which may be required by the Division of Environmental
Management or permits required by the Division of Land Resources, the Coastal Area Management Actor
any Federal or Local other, governmental permit that may be required.
If you have any questions or need additional information, please contact Charles Alvarez,
telephone number 919/733-5083.
Sincerely,
Original Signed By
David A. Goodrich
A. Preston Howard, Jr., P.E.
cc: Guilford County Health Department
Winston-Salem Regional Office, Water Quality
Training and Certification Unit
Ogden Environmental,Barry Dellzel
Winston-Salem Regional Office, Groundwater

STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT, HEALTH, AND NATURAL RESOURCES
DIVISION OF ENVIRONMENTAL, MANAGEMENT
IN 01 RVIVIN MOM
.-MM� l i
TO DISCHARGE PETROLEUM CONTAMINATED GROUNDWATER AND SIMILAR WASTEWATERS
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,
Piedmont Natural Gas Company
is hereby authorized to construct and operate a groundwater treatment system consisting of an oil/water separator, an
air stripping system and carbon filtration for petroleum contaminated groundwater or similar waste streams with the
discharge of treated wastewater from a facility located at
Former Service Operations Center
1029 Winston Street
Greensboro
Guilford County
to receiving waters designated as an unnamed tributary to Muddy Creek in the Cape Fear River Basin
in accordance with the effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II, III
and IV of General Permit No. NCG510000 as attached.
This certificate of coverage shall become effective September 9, 1994
This Certificate of Coverage shall remain in effect for the duration of the General Permit.
Signed this day September 9, 1994
Original Signed By
David A. Goodrich
A. Preston Howard, Jr., P.E., Director O
Division of Environmental Management
By Authority of the Environmental Management Commission

TO: Permits and Engineering Unit, DEM, WQ
Technical Services
Central Files
WSRO-GWQ
WSRO-WQ
*** Date May 25 1994 ***
SOC Priority Project: Yes:_ NO:_X_
If Yes, SOC Number.
To: Permits and Engineering Unit/ Water Quality Section
***** Attention: Charles Alvarez*****
GWR-NPDES-DISCHARGE STAFF REPORT AND RECOMMENDATION
NC.G 5 k o Zo 3
COUNTY:*GUILFORD* *** Permit No.NEGWQAAM Ln ***
PART I - GENERAL INFORMATION -(RENEWAL)
i.a. Facility Address: former Piedmont Natural Gas Company,
now occuppied by Mill -Power Supply Company, 1029 Winston
Street, Greensboro, NC, Guilford County
OZ
b. Mailing Address: Mr. Mike Parrot, Maij 03-0(0-/+
Superintendent, Piedmont Natural Gas Compai �T Mu�o vreeu
33068 (1915 Rexford Road), Charlotte, NC I
2. Date of Investigation: May 12, 1994, at
3. Report Prepared by: Arthur R. Hagstrom,
Engineer, DEM, WQ, WSRO
4. Persons Contacted and Telephone Number:
Alan Martin, Staff Geologist with OGDON Environmental and
Engineering Services, Consultant, 704-875-3570
FAX [phone]
5. Directions to Site: East of US-29 at 1029 Winston Street
( between Bessemer and East Wendover Avenues). The GWR site
is closer to Huffman Street at the back of the former
Piedmant Natural Gas Company site.
6. Size (land available for expansion and upgrading):
Approximately 2 1/2 acres, partially paved. The site is
now the site of another business.
7. Topography (relationship to 100 year flood plain
included): 50 % +/- paved or buildings. Slopes from 2 to 5
% to the West. Not in flood plain.
8. Discharge Point: Elevation/ 550'
Latitude/ 36deg05min06sec Longitude/ 79deg45min48sec
U.S.G.S.Quad No.:C19SE U.S.G.S.Quad Name: e
-URED\-/
PL

Piedmont Natural Gas/GWR/ NCG510203
Page 2 of 3
8. Location of nearest dwelling and water supply well:
Site is in the City with municipal water. No potable
water wells are in the area. Contamination is into
fractured rock and goes very deep.
9. Nearest Watershed Stream Basin Information: City Storm
sewer to Muddy Creek to North Buffalo Creek
a. Watershed Classification: Class " C-NSW ^
b. River Basin and Subbasin No.: Cape Fear/ 03-06-02
c. Will be discharged to a storm sewer at the north side
of the property and then by storm sewer to the north and
then west to Muddy Creek.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. Type of wastewater, sludge or contaminated soil:
Petroleum contaminated groundwater from former Piedmont
Natural Gas Company fueling system for their vehicles.
They used Regular Gasolene.
0% Domestic =% Industrial
a. Volume: 72,000 GPD of treated groundwater.
b. Types and quantities of industrial wastewater: Petroleum
contaminated ground water (regulay gasoline) that will be
treated and discharged (72,000 GPD).
a. Prevalent toxic constituents in wastewater:
Petroleum products
b. Pretreatment Program (POTWs only): N/A
in development approved
should be required not needed
2. Production rates (industrial discharges only) in pounds
per day: N/A
a. Highest month in the past 12 months: lbs/y lbs
b. Highest year in the past 5 years: /day•
3. Description of industrial process (for industries only)
and applicable CFR Part and Subpart: N/A
4. Type of treatment (specify whether proposed or
existing): The remediation system consists of recovery
wells, electric submersible sump pumps, recovery pump,
an oil/water separator, air stripping, ground water
filtration, activated carbon canisters, piping,valves,
flow measurement, over -fill and by-pass prevention.
5. Sludge handling and disposal scheme: Contract disposal
firm if needed. Some solids may be collected in filter
cartridges.

Piedmont Natural Gas/GWR-NCG510203
Page 3 of 3
6. Treatment plant classification: (Attach completed
rating sheet): Grade I, 21 points
7. SIC Code(s): 4924 The company had an onsite gasoline
pump for its own vehicles
Wastewater Code(s): 3G
WR
Remediationwithdischarge
Secondary: 82 GWR
Main Treatment Unit Code: 5 6& 5 5* 0 X 6**
* oil/water separation plus air stripping & Act. Carbon
** contract disposal of non-volatile materials
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction
Grant Funds (municipals only)? No
2. Special monitoring requests: No
3. Other: a. This project is one of the worst GWR site in
the Region because of the deep penetration of product
through fractured rock. The remediation system is
needed to remove the groundwater contamination.
b. The City storm sewer is the only available
path to surface water for the cleaned groul,ndwater.
PART IV - EVALUATION AND RECOMMENDATIONS
The WSRO recommends the permitting of this system in
accordance with current DEM regulations and including
any GW input.
Signature of Repor reparer
er Quality Tonal Supervisor
7 = a issue
ate