NCG080170_Automatic Renewal Issuance Letter with COC_20121212

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NCDENR
North Carolina Department of Environment and Natural Resources
Beverly Eaves Perdue
Governor
Stephen Williams
AT Williams Oil Company
PO Box 7287
Winston Salem, NC 27109-7287
Dear Permittee:
Division of Water Quality
Charles Wakild, P. E.
Director
December 12, 2012
Dee Freeman
Secretary
Subject: NPDES Stormwater Permit Coverage Renewal
A T Williams Oil Co -Wilco
COC Number NCG080170
Iredell County
This letter serves as your notification that the Division of Water Quality (DWQ) has reissued General Permit
NCGO80000 and that your facility's coverage will continue under the conditions of the reissued general permit.
Please review the new permit to familiarize yourself with the changes in the reissued permit. This permit is
reissued pursuant to the requirements of North Carolina General Statute 143-215.1 and the Memorandum of
Agreement between the state of North Carolina and the U.S. Environmental Protection Agency, dated October
15, 2007 (or as subsequently amended).
The following information is included with your permit package:
• A new Certificate of Coverage (COC)
• A copy of General Permit NCG080000
• A copy of the Technical Bulletin for the General Permit
• Two copies of the Discharge Monitoring Report (DMR) Form
• Two copies of the Qualitative Monitoring Report Form
The General Permit authorizes discharges of stormwater, and it specifies your obligations for discharge
controls, management, monitoring, and record keeping. Please review the new permit to familiarize yourself
with all the changes in the reissued permit. Your facility has six (6) months from the time of receipt of the
permit to update your current SPPP to reflect all new permit requirements.
The first sample period of your permit begins January 1, 2013. Your facility must sample a "measureable
storm event" beginning during the periods beginning January 1 and July 1 of every year (or, if applicable,
report "No Flow," as outlined in Part III, Section E). Also, please note that Tier 3 Actions in Part II of your
permit are triggered by benchmark exceedances on four occasions beginning on the effective date of this
permit and do not count prior exceedances.
The more significant changes in the General Permit since your last COC was issued are noted either in the
Draft Permit Fact Sheet that accompanied the public notice (http://portal.ncdenr.org/web/wq/ws/su/current-
notices), or in the Response to Comments / Summary of Changes and Technical Bulletin documents that are
posted on the Stormwater Permitting Unit's website with the new General Permit. Please visit
http://Portal.ncdenr.org/web/wq/ws/su/npdessw (click on 'General Permits' tab) to review that information
for your specific General Permit carefully.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604 One
Phone: [phone] \ FAX: [phone] NorthCarolina
Internet: www.ncwatergualitv.org �atllra!!l�
An Equal Opportunity \ Affirmative Action Employer

Stephen Williams
December 12, 2012
Page 2 of 2
Some of the changes include:
• Part II:
• Section A: The Stormwater Pollution Prevention Plan (SPPP) section, if applicable, has been updated
to the most current language of our permits. Additional conditions for specific industry sectors have
been added to the SPPP requirements in some cases.
• Sections 8, C: Failure to perform analytical stormwater monitoring may result in the Division requiring
that the permittee begin a monthly sampling scheme.
• Sections 8, C: A lower TSS benchmark of 50 mg/I for HOW, ORW, PNA and Tr Waters applies to these
more sensitive waters.
• Sections 8, C. The monitoring parameter Oil & Grease (O&G) has been replaced by the parameter
Total Petroleum Hydrocarbons (TPH) for vehicle maintenance areas, and in some cases, other
analytical monitoring requirements.
• Sections e, C, D: Inability to sample due to adverse weather must be recorded in the SPPP, or in
separate on-site records if your General Permit does not require an SPPP. Adverse weather is defined
in the "Definitions" section of the permit.
• Sections 8, C. The term "Representative Storm Event" has been replaced by "Measurable Storm
Event." A measurable storm event is defined in the permit.
• Section D: If the permittee fails to respond effectively to problems identified by qualitative
monitoring, DWQ may require the permittee to perform corrective action.
Please review Parts III and IV to understand the Standard Conditions of your new NPDES General Permit,
including Compliance and Liability, Reporting, Monitoring and Records requirements; Operation and
Maintenance obligations; and Definitions. Please note that all samples analyzed in accordance with the terms
of this permit must be submitted to the Division on Discharge Monitoring Report (DMR) forms available on
the Stormwater Permitting Unit's website above. DMR forms must be delivered to the Division no later than
30 days from the date the facility receives the sampling results from the laboratory. Also note that existing
permittees do not need to submit a renewal request prior to expiration unless directed by the Division.
Your coverage under the General Permit is transferable only through the specific action of DWQ. This permit
does not affect the legal requirements to obtain other permits which may be required by DENR, nor does it
relieve the permittee from responsibility for compliance with any other applicable federal, state, or local law,
rule, standard, ordinance, order, judgment, or decree. If you have any questions regarding this permit
package, please contact the Division's Stormwater Permitting Unit at [phone].
Sincerely,
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for Charles Wakild, P.E.
cc: DWQ Central Files
Stormwater Permitting Unit Files
Mooresville Regional Office

STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
GENERAL PERMIT NO. NCG080000
CERTIFICATE OF COVERAGE No. NCG080170
STORMWATER
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,
AT Williams Oil Company
is hereby authorized to discharge stormwater from a facility located at:
A T Williams Oil Co -Wilco
1006 Charlotte Hwy
Troutman
Iredell County
to receiving waters designated as Kerr Creek, a class WS-II;HQW waterbody in the Yadkin
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. NCG080000 as attached.
This certificate of coverage shall become effective December 12, 2012.
This Certificate of Coverage shall remain in effect for the duration of the General Permit.
Signed this 12th day of December, 2012.
for Charles Wakild, P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission