NCG030139_Tier Relief Letter_20211019

DocuSign Envelope ID: 7AF87DC1-EDC3-478B-A5C8-6DED7EAE6AOC
ROY COOPER
Governor,5'
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ELIZABETH S. BISER
Secretary
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BRIAN WRENN
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Director
NORTH CAROLINA
Environmental Quality
October 19, 2021
Mueller Systems
Attention: John Small
10210 Statesville Boulevard
Cleveland, North Carolina 27013
Subject: NPDES Stormwater Permit
Stormwater Permit Certificate of Coverage No. NCG030139
Mueller Systems
Rowan County
Dear Mr. Small:
We are in receipt of your September 15, 2021 email requesting relief from monthly monitoring at the
Mueller Systems Cleveland plant. Based on past site inspections, including September 15, 2021, and email
correspondence regarding copper and zinc, the facility is in compliance with the tiered response actions and
other conditions of the NCG030139 Permit. Therefore, the Division is granting regulatory relief from the Tier
responses. Upon receipt of this letter, the subject facility may resume the permit specified quarterly analytical
monitoring for the remainder of the current permit term which expires on June 30, 2026. This decision applies
only to the copper and zinc benchmarks. A benchmark exceedance of any other parameter listed in your permit
will trigger the tiered response actions as described in the general permit.
You must notify this office, in writing, within five business days if you become aware of any other
significant source of copper or zinc 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 the Mueller Systems Cleveland
plant. 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 me or James Moore at 704-663-1699.
Sincerely,
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Zahid S. Khan, CPM, CPESC, CPSWQ
Regional Engineer
Land Quality Section
cc: Stormwater Laserfiche
10 North Carolina Department of Environmental Quality I Division of Energy, Mineral and Land Resources
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D;,.EQQP Mooresville Regional Office 1 610 East Center Avenue, Suite 3011 Mooresville, North Carolina 28115
704-663-1699
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