DSHW-2024-009170

November 14, 2024
John Amato, Project Manager
Refining Business Unit
Chevron Environmental Management Company
324 West El Segundo Blvd. (MO-142)
El Segundo, CA 90245
RE: Hydrolyzed Ionic Liquid Catalyst Release Response
Post-Closure Permit Chevron Salt Lake Refinery
UTD092029768
Dear Mr. Amato:
The Division of Waste Management and Radiation Control has completed its review of your letter dated November 1, 2024, which attached areport of the Hydrolyzed Ionic Liquid Catalyst
Release Response (the Report) prepared by AECOM. On September 26, 2024, Chevron verbally notified Division staff of a release of hydrolyzed ionic liquid catalyst from a frac tank on
the same day, which over-topped at the Chevron Salt LakeRefinery. On September 27, Division staff met with both Chevron and AECOM personnel at the refinery and observed the soil cleanup
effort. On October 10, 2024, Chevron followed up the spill with a written notice to the Divisionrequired by the requirements of the Chevron’s Post-Closure Permit.
The Report summarizes the response activities to the spill following the Division’s Recommended Best Management Practices for Documenting Cleanup Actions for Releases of PetroleumProducts
at Salt Lake Valley Refineries. The Report also include spill recovery, soil removal, waste characterization, soil confirmation sampling results, analytical laboratory reports, and data
validation.
The soil confirmation sampling results indicates that the soil impacts are below the US Environmental Protection Agency Regional Screen Levels for residential soiland threat to the groundwater
criteriafor volatile and semi-volatile organic compounds. Soil arsenic concentrations are within the background levels found in Salt Lake County, Utah. The removed soil is below the
TCLP thresholds, and therefore is not a characteristic hazardous waste. No further action is proposed for the spill.
Based on our evaluation, Chevron has met all requirements for reporting and cleanup of the spill. The Report is approved, and the spill is hereby closed.
If you have any questions, please contact Hao Zhu at 801-558-9833.
Sincerely,
Douglas J. Hansen, Director
Division of Waste Management and Radiation Control
DJH/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 Hatch, Health Officer, Davis County Health Department
David W. Spence, Deputy Director, Davis County Health Department
Jay Clark, Environmental Health Director, Davis County Health Department
Lauren Vander Werff, Chevron Salt Lake Refinery (Email) [e-mail]
Kari Lundeen, Division of Waste Management and Radiation Control
Deborah Ng, Division of Waste Management and Radiation Control
Brett Mustoe, AECOM (Email) [e-mail]
Wil Pineda, AECOM (Email) [e-mail]
John Amato, Project Manager, Refining Business Unit,
Chevron Environmental ManagementCompany (Email and Hard Copy)[e-mail]