HomeMy WebLinkAboutDAQ-2024-004446
Rio Tinto Kennecott Utah Copper, LLC. 4700 Daybreak Parkway, South Jordan, Utah 84009.
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Rio Tinto Kennecott
4700 Daybreak Parkway
South Jordan, Utah 84009
January 29th, 2024
Mr. Bryce Bird, Director
Utah Department of Environmental Quality
Division of Air Quality
P.O. Box 44820
Salt Lake City, UT 84114-4820
Attention: Mr. Connor Kijowski
Subject: Copperton Concentrator
Approval Order DAQE-AN105710044-18
Molybdenum Plant Wet Scrubbers Semi-Annual Report
Dear Mr. Bird:
In accordance with Condition II.B.2.a of Approval Order DAQE-AN105710044-18, dated
August 21, 2018 and 40 CFR 60.385(c), Kennecott Utah Copper (KUC) is required, at
least weekly, to monitor and record measurements of scrubber pressure loss or gain and
liquid flow rates differing by more than thirty percent (30%) from the average obtained
during the most recent performance tests. The most recent performance tests for DC-04
and DC-190 were conducted in June and November 2002, respectively.
A review of the records for the second half of 2023 (July through December) was
completed in January 2024. Records for the following wet scrubbers (permitted
emission sources) at the Copperton Concentrator were reviewed:
MP106 Product Molybdenum Dryer Venturi Scrubber (DC-04)
MP107 Product Molybdenum Dryer Venturi Scrubber (DC-190)
The monitored and recorded pressure and flow rate readings for the operating venturi
scrubbers (DC-04 and DC-190) were within acceptable ranges with the following
exceptions.
DocuSign Envelope ID: 74D3657F-C30C-4DE6-B7D3-300EFBC36473
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• July 24th through July 25th, DC-190 scrubber; unit was taken offline and adjusted
by the next operating shift.
• September 18th through September 19th, DC-04 scrubber; unit was taken offline
and adjusted by the next operating shift.
• October 13th, DC-04 scrubber; unit was taken offline and adjusted by the next
operating shift.
• November 1st, DC-04 scrubber; unit was taken offline and adjusted by the next
operating shift.
Should you have any questions or need further information regarding this letter, please
contact me or Sean Daly at 801-913-4456.
Sincerely,
Brendan Murphy
General Manager – Minerals
DocuSign Envelope ID: 74D3657F-C30C-4DE6-B7D3-300EFBC36473