DSHW-2024-006356

May 16, 2024
Lonnie Brown
Chief, Environmental Division
1 Tooele Army Depot
JMTE-BON, Bldg. 501
Tooele, UT 84074-5003
RE:Approval of Fall 2023 Post Closure Permit Monitoring Sentinel Well Evaluation, Tooele Army Depot North AreaEPA ID #UT3213820894
Dear Mr. Brown:
The Division of Waste Management and Radiation Control has reviewed the Fall 2023 Post Closure Permit Monitoring Sentinel Well Evaluation (the Evaluation) for the Tooele Army Depot North
Area (TEADN), dated April 29, 2024. The Evaluation notifies the Director that sentinel monitoring well B-42 had a detection of trichloroethene (TCE) equal to or exceeding 1.0 micrograms
per liter (µg/L) for the first time during the Fall 2024 Post Closure Permit Monitoring Event in accordance with the TEADN Part B Permit Condition IX.E.1.a. TEADN will continue semi-annual
monitoring of this well.
The Division has no questions or concerns, and the Evaluation is hereby approved.
If you have any questions, please call Jasin Olsen at [phone].
Sincerely,
Douglas J. Hansen, Director
Division of Waste Management and Radiation Control
DJH/JO/wa
c:Jeff Coombs, Health Officer, Tooele County Health Department
Bryan Slade, Environmental Health Director, Tooele County Health DepartmentTyson Erickson, Environmental Protection Specialist, TEADN ([e-mail])Annette Maxwell,
USEPA, Region 8 ([e-mail])Tara Hubner, USEPA, Region 8 ([e-mail])