DWQ-2025-004720

May 29, 2025Alec Klinghoffer, VP Refinery ManagerBig West Oil LLC333 West Center Street North Salt Lake, Utah [e-mail] EmailSubject:Public Notice of Modified
UPDES Permit No. UT0026174Big West OilDear Mr. Klinghoffer:Enclosed is a draft copy of the Modified UPDES Permit No. UT0026174, Fact Sheet, Waste Load Analysis, and the Public Notice
information for the facility referenced above. This information is being made available online at https://deq.utah.gov/water-quality/water-quality-public-notices during the 30-day public
comment period as appropriate.Thank you for your efforts to help protect Utah’s water quality. If you have any questions with regard to this matter, please contact Daniel Griffin 536-4387
or [e-mail] .Sincerely,Danielle LenzDanielle Lenz, ManagerUPDES Individual Permit SectionDL/DG/cjhEnclosures:1. BWO UPDES Modification Permit DRAFT 2025(DWQ-2025-0)2. BWO UPDES
Modification Fact Sheet DRAFT 2025(DWQ-2025-0)3. Big West Oil RO WLA 2024 Preliminary(DWQ-2024-007178)4. BWO Permit Modification L2ADR (DWQ-2025-004563)5. BWO UPDES Modification PN Document
2025(DWQ-2025-0)Cc:Via Email w/Enclosures Amy Maybach, US EPA Region VIIIStephanie DeJong, US EPA Region VIIIMichael Boeglin, US EPA Region VIIIJay Clark, Davis County Health DepartmentEric
Simdorn, Environmental Engineer, BWO, [e-mail]r, Environmental Manager, BWO, [e-mail]
Via Email w/out EnclosuresRiley Peck, Utah Division of Wildlife [e-mail] Gipson, Regulatory Office, US Corps of Engineers Chris Merritt, State Historic Preservation
Office DWQ-2025-xxxxxx