NCG030098_Elevated Results_20211124

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PECEIVEDINCDEQIDWR
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November 17, 2021
WQROS
Mr. Corey Basinger MOORESVILLEREGIONALOFFICE
Environmental Regional Supervisor
Water Quality Regional Operations Section
Mooresville Regional Office
North Carolina Department of Environmental Quality
610 Easter Center Avenue, Suite 301
Mooresville, NC 28115
Trane U.S., Inc.
4500 Morris Field Drive
Charlotte, NC 28208
[phone]
FedEx Tracking Number: 918162008936
Re: Notification of Elevated Stormwater October 2021 Benchmark Analytical Results
Trane U.S., Inc., 4500 Morris Field Drive, Charlotte, NC 28208
Stormwater Certificate of Coverage Number NCG030098
Dear Mr. Basinger:
Trane U.S., Inc. (Trane) owns and operates the HVAC equipment remanufacturing facility located at 4500 Morris Field
Drive, Charlotte, NC. Trane's stormwater is authorized via Certificate of Coverage No. NCG030098 issued by the NC
Department of Environmental Quality (DEQ) under Stormwater Metal Fabrication General Permit Number NCG030000
(Permit).
Trane completed the required monthly stormwater monitoring for the October 2021 performance period with the
laboratory report received on November 3, 2021. The October monitoring results indicate elevated readings for Copper
and Zinc. Per provisions under Part E of the Permit, this letter serves as Trane's written notification to DEQ of the
October elevated results.
Following receipt of the October results, Trane completed the required site inspection to identify possible causes of the
elevated concentrations. No clear root causes were noted.
The below table summarizes the recent testing results. With the fourth elevated result for Copper, a Tier Three Response
is required per Term E.7 of the Permit. Trane is developing the required Action Plan which is due DEQ by December
3, 2021 (within 30 days of receipt of the October laboratory report).

NC DEQ Letter November 17, 2021 Page 2 of 2
As communicated in our October 15, 2021 notification letter to DEQ, Trane has experienced an ongoing challenge with
the Copper and Zinc benchmarks as represented in previous monthly Discharge Monitoring Reports. Past investigative
studies suggest rain falling on the Trane property contains measurable concentrations of Copper/Zinc in some cases at
or near the benchmark values. We recognize that other Trane site factors may also contribute to the elevated stormwater
concentrations.
If you have any questions related to this notification, please contact Ms. Carrie Nguyen, Trane Charlotte EHS Manager,
by telephone at [phone] or by email at [e-mail].
Kind regards,
tt -
Murthy K tike
Business Process Leader
Trane — Charlotte Operations