DRC-2024-007387

October31, 2024
Liz Ruedig, Site Manager
Rio Algom Mining LLC
P.O. Box 218
Grants, NM 87020
RE: Rio Algom Mining LLC, Lisbon Facility(“RAML”)Lisbon Valley Facility, Utah; Radioactive Material License Number 1900481;Utah Division of Waste Management and Radiation Control (“Division”)Field
Inspection and Split Sampling; Closeout Letter.
Dear Ms.Ross:
The Divisioncompleted the inspection and split sampling that occurred on October 18, 2024, for the groundwater monitoring event (“Monitoring Event”) for RAMLat the former Lisbon Valley
Uranium Mill Facility (“Facility”).This inspection included the collection of split samples by the Division of selected groundwater monitoring wells.
The inspection was based on compliance with the:Rio Algom Mining LLC, July 31, 2015, Groundwater Monitoring Plan Lisbon Facility(“Plan”).Utah Radioactive Materials License No. UT1900481,
Amendment 6 (License).
The findings of this inspection and results of the analytical analysis for the Division split samples of the wells will also be included as part of the Division review of the 2024 Annual
Groundwater Monitoring Report due by March 1, 2025.
Based on Division staff observations of RAML staff performing the sampling and monitoring on October 18, 2024, it appears that the staff follows field sampling requirements in the Plan
and License. This letter constitutes a closeout of the field inspection performed on October 18, 2024, for the 2024 annualgroundwatermonitoring event.
If you have any questions, please contact Chris Leahy at [phone].
Sincerely,
Adam Wingate, Uranium Recovery Section Manager
Division of Waste Management and Radiation Control
AJW/CL/wa
c:Grant Sunada, Executive Director/Health Officer, San Juan County Public Health Department
Dennis Shumway, Environmental Health Director, San Juan Public Health Department
Curtis Page, P.E., UDEQ District Engineer
Sandra L. Ross, Vice President, Rio Algom Mining LLC