DSHW-2024-004094

January 17, 2024
Terry R. Etter
Real Estate and General Services
Unisys Corporation
3199 Pilot Knob Road
Eagan, MN 55121
RE: 2021-2022 Biennial Status Report
Unisys Salt Lake City Facility
322 North 2200 West, Salt Lake City, Utah
EPA ID: UTD009073214
Dear Mr. Etter:
The Division of Waste Management and Radiation Control Waste (Division) has completed its review of your2021-2022 Biennial Status Report(Report) dated November 30, 2023 for the Unisys
Salt Lake City site. The Report includes the groundwater monitoring results and summarizes the activities completed during the years of 2021-2022. The Report also includes an evaluation
of natural attenuation of the groundwater contamination and a statistical analysis of the past monitoring data. The Report indicates the concentrations of volatile organic compounds
present in the groundwater are decreasing over time and have reached asymptotic levels at the site.
Unisys will need to continue the groundwater monitoring in accordance with the approved groundwater monitoring program specified in the Division’s April 22, 2021 letter and Section 3.3
– Groundwater Monitoring of the updated Site Management Plan dated January 2024. In the future, groundwater monitoring will be conducted every five years starting the year 2027. The
Division cannot agree to reduce or eliminate the groundwater monitoring at the site as proposed in the Report at this time.
(Over)
If you have any questions, please contact Hao Zhu by email at [e-mail] phone at 801-558-9833,
Sincerely,
Paige Walton, Program Manager
Corrective Action Section
Division of Waste Management and Radiation ControlPW/HZ/wa
c:Angela C. Dunn, MD, MPH, Health Officer, Salt Lake County Health Dept.
Dorothy Adams, Deputy Director, Salt Lake County Health Dept.
Ron Lund, Environmental Health Director, Salt Lake County Health Dept.Brian Smith, Geosyntec Consultants (Email) ([e-mail])Terry Etter, Unisys Corporation (Email and Hard
Copy) ([e-mail])