NCG030027_Tier Relief_20220215

ROY COOPER
Govern rx-
ELIZABETH S. BISER
Secretary
BRIAN WRENN
Direrror
Eaton Corporation
Attn: Edmara Bloomer
EHS Manager
2564 Durham Road
Roxboro, NC 27573
41.
NUQ.I II CAROLINA
Enrironmentat Quality
February 15, 2022
SUBJECT: NPDES Stormwater Permit: Request for Regulatory Relief
Eaton Corporation
General Permit No: NCG030000; COC No: NCG030027
Person County
Dear Ms. Bloomer:
In response to your request for Regulatory Relief, NCDENR-Land Quality Section staff reviewed
provided sample reports, site maps and discussed site characteristics with Edmara Bloomer the
EHS Manger for Eaton Corporation.
Monthly monitoring has been triggered due to continuous exceedances of the copper
benchmarks at your facility. Please keep in mind that benchmark exceedances are NOT limit
violations or violations of permit conditions; however, you are obligated to follow the tiered
response actions outlined in your permit. Eaton Corporation has been following the tiered
response actions and is therefore in compliance with the permit.
Based on the past samples taken and because of the investigation undertaken to identify the
cause and source of the Copper exceedances identified in the sample outfalls at the Eaton
Corporations facility boundaries, we find that production activities may have little or no
influence on the Copper levels being recorded. For that reason, we are granting regulatory
relief in the form of a collapsed Tier 2 —Tier 3 response. Upon receipt of this letter, Eaton
Corporation may resume the permit's newly specified quarterly analytical monitoring for the
remainder of your current permit. Your current permit is set to expire on June 30, 2026. This
decision applies only to the copper and its benchmarks. A benchmark exceedance of any other
parameter listed in your permit will trigger tiered response actions as described in the general
permit.
North Carolina Department of Environmental Quality I Division of Energy, Mineral and Land Resources
Raleigh Regional Office I Ib28 Mull Service Center 13800 Barrett Drive I Raleigh, North Carolina 27b0{3
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019,7n1.4200

You must notify this office in writing, within five business days, if you become aware of any
significant source of copper at your facility that has the potential to be exposed to stormwater.
The relief granted in this letter is contingent upon the current industrial practices at Eaton
Corporation. If industrial practices change and copper does become a significant stormwater
exposure risk, then this office reserves the right to withdraw this decision and reinstate the
permit -specified tiered response or other actions that may be warranted by the new set of
circumstances.
Please retain and append this letter to your Stormwater Pollution Prevention Plan (SPPP) or
permit. If you have any questions or comments concerning this letter, please contact Thad
Valentine or me at [phone].
Sincerely, /
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William H. Denton, IV, PE
Regional Supervisor-- RR4