NCS000373_Permit modification_20240131

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ROY COOPER
Go�ernnr � ;.
ELIZABETH S.BISER `
Secretary Viiwr
WILLIAM E.TOBY VINSON,JR NORTH CAROLINA
Interim Director Environmental Quality
January 31, 2024
Shannon Bernhardt, Plant Manger
Michelin Aircraft Tire Company - Michelin North America, Inc.
40589 S Stanly School Road
Norwood,NC 28128
Subject: Minor Permit Modification
NPDES Permit NCS00373
Michelin Aircraft Tire Company
Stanly County
Dear Permittee:
The Division of Energy, Mineral, and Land Resources (the Division) received your modification
request on August 23, 2023 requesting removal of outfalls SW01A, SW01B, and SW01C. After
discussion with the Mooresville Regional Office, the Division approves removal of these outfalls
from the permit.
Accordingly, we hereby forward the modified permit pages to amend your permit removing outfalIs
SW01A, SW0113, and SW01C. Please insert these change pages into your existing permit and
discard the old pages.
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 Energy,
Mineral, and Land Resource or any other Federal, State, or Local governmental permits that may be
required.
If you have questions, or if we can be of further service,please contact Brianna Young at
[e-mail] or call 919-707-3647.
Sincerely,
$0-�
Brianna Young, Industri ndividual Permit Coordinator
Division of Energy, Mineral, and Land Resources
Attachments: NPDES Stormwater Permit NCS000606
cc: NPDES Stormwater Program Files(Laserfiche)
Mooresville Regional Office
Heather Ashby, Environmental Health and Safety Manager, RGEP-Michelin Aircraft Tires
North Carolina Department of Environmental Quality Division of Energy.Mineral and Land Resources
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512 North Salisbury St reet 11612 Mail Service Center 1 Raleigh.North Carolina 27b99 1612
fl c .i Ea nmr 919.707.9200

Permit NCS000373
Table 1. Summary of Quarterly Baseline Sampling Requirements for Stormwater
Dischar es for Outfalls SWO01 and SWO02
Parameter Code for Parameter, Frequency Benchmark
Reporting
C0530 Total Suspended Solids(TSS) Quarterly 100 mg/L
00400 pH Z Quarterly 6 s.u.—9 s.u.
46529 Total Rainfall of Sampled Event - -
(inches)s
Non-Polar Oil&Grease for drainage
00552 areas that use>55 gallons/month of Quarterly 15 mg/L
oil on average per EPA Method 1664
(SGT-HEM)
NCOIL Estimated Average Monthly Oil - -
Usage at the Facility(gallons)
00340 Chemical Oxygen Demand(COD) Quarterly 120 mg/L
Footnotes:
1. Measurement frequency: Quarterly during a measurable storm event. If the facility is monitoring
monthly due to Tier Two or Tier Three response actions,the facility shall continue a monthly
monitoring and reporting schedule in Tier Two or Tier Three status until relief is granted.
2. If pH values outside this range are recorded in sampled stormwater discharges,but ambient
precipitation pH levels are lower,then the lower threshold of this benchmark range is the pH of
the precipitation(within instrument accuracy) instead of 6 s.u.. Readings from an on-site or local
rain gauge(or local precipitation data)must be documented to demonstrate background
concentrations were below the benchmark pH range.
3. For each sampled measurable storm event,the total precipitation must be recorded.An on-site
rain gauge is required. Where isolated sites are unmanned for extended periods of time, a local
rain gauge reading may be substitute for an on-site reading.
• Outfall SW001: Drainage area includes the Aviation Tires building and Semi-Finished
warehouse, East parking lot, shipping entrance, trailer parking, docks, and cooling
towers.
• Outfall SWO02: Drainage area includes the roof structure for Retreading Aviation Tires
building, waste containers,trailer parking, dust collectors, a small wooded area, West
parking lot, and cooling towers. A cow pasture next door flows directly into the site
drainage.
Additional Outfalls
Stormwater outfalls SWO03 and SWO04 do not contain Industrial Activity. Any modifications
to these outfalls that result in a potential stormwater discharge associated with past or
present industrial activities will require a modification of this permit.
Page 13 of 37

Permit NCS000373
Should the permittee identify or create any new stormwater outfalls,remove any stormwater
outfalls identified in this permit, or alter any drainage areas that change the potential pollutants in
runoff discharged through corresponding outfalls,the permittee will submit a request to NC
DEMLR to modify this permit. For any newly discovered pipes or outfalls, the permittee must
evaluate the structure and provide a report of the status and planned actions to NC DEQ within
14 days. The permittee must either(1)request modification of this permit and modify the
SWPPP accordingly, or(2) eliminate potential discharges by removal,plugging, or combination
of both.
D-3. Methodology for Collecting Samples
(a) Outfall monitoring efforts shall begin with the first measurable storm event that occurs
during the facility's normal operating hours and begins at least 72 hours after the previous
measurable storm event.
(b) Grab samples shall be collected within the first 30 minutes of discharge. If physical
separation between outfalls prevents collecting samples from all outfalls within the first 30
minutes of discharge, then the permittee may continue collecting samples until all outfalls
that are discharging have been sampled.
(c) Outfalls that are not discharging during or after the first measurable storm event shall be
sampled during the next measurable storm event, until a sample has been collected from
every outfall.
(d) If, during an entire monitoring period,there is no discharge from an outfall during any
measurable stonn event that occurs during the facility's normal operating hours and
begins at least 72 hours after the previous measurable storm event, then the permittee shall
report"No Discharge" in the DMR and shall record"No Discharge" in the SWPPP. In this
case, the DMR shall be submitted within 30 days after the end of the monitoring period.
Lack of a discharge from an outfall for the monitoring period shall not constitute failure to
monitor as long as this condition is met.
(e) Sampling is not required to be performed outside of the facility's normal operating hours
or during adverse weather conditions.
(f) Samples collected shall be characteristic of the volume and nature of the permitted
discharge.
(g) If the sampled storm event coincides with a known non-stormwater discharge that is
deemed permitted under 15A NCAC 02H .0106,then this shall be noted on the
stormwater discharge monitoring report.
D-4. Locations for Collecting Samples
Samples shall be collected at all stormwater discharge outfalls (SDOs)that discharge stormwater
associated with industrial activity. If the Division has issued a representative outfall status (ROS)
approval letter, then the permittee shall collect samples from all SDOs in accordance with the
ROS approval letter.
(a) All samples shall be taken before the discharge joins or is diluted by any other waste
stream, body of water, or substance.
Page 14 of 37