Burns Person Responsible for Operation (870-310-1501) hrowan@ecgcpa.com FRS Number: Identification/Permit Number: Media Identifier Number: NAICS: SIC: N/A ARU002290 N/A 211111 1311 Personnel participating in inspection: Kerri McCabe (lead) EPA / Region 6 ECDW Michael Blaha EPA / Region 6 ECDW Inspector / Enforcement Officer Inspector / Enforcement Officer EPA Lead Inspector Signature/Date Supervisor Signature/Date KERRI MCCABE Kerri McCabe Digitally signed by KERRI MCCABE Date: 2025.04.10 15:49:41 -05'00' Date JEANNE ECKHART Date: 2025.04.14 07:37:19 -05'00' Digitally signed by JEANNE ECKHART Jeanne Eckhart Date 6ENFORM-019-R8.2 (02/12/2020) 1 Nevada Oil, LLC / Irma Nacatoch Unit SWD/EOR Tank Battery (ARU002290 / CWA) Inspection Date 03/05/2025 Section I - INTRODUCTION PURPOSE OF THE INSPECTION EPA Region 6 inspectors Kerri McCabe (lead) and Michael Blaha arrived at the Nevada Oil, LLC / Irma Nacatoch Unit SWD/EOR Tank Battery ("facility") located from State Highway 371 North, right on Hwy 76, and then right onto an oilfield lease road at 33.545100, -93.218400 in Willisville, Nevada County, Arkansas; at 1320 on 03/05/2025 for an unannounced inspection.

Burns Person Responsible for Operation (870-310-1501) hrowan@ecgcpa.com FRS Number: Identification/Permit Number: Media Identifier Number: NAICS: SIC: N/A ARU002305 N/A 211111 1311 Personnel participating in inspection: Kerri McCabe (lead) EPA / Region 6 ECDW Michael Blaha EPA / Region 6 ECDW Uma Lad EPA / Region 6 ECDW Inspector / Enforcement Officer Inspector / Enforcement Officer Inspector / Enforcement Officer EPA Lead Inspector Signature/Date Supervisor Signature/Date KERRI MCCABE Kerri McCabe Digitally signed by KERRI MCCABE Date: 2025.05.29 13:18:17 -05'00' Date JEANNE ECKHART Date: 2025.06.03 06:07:02 -05'00' Digitally signed by JEANNE ECKHART Jeanne Eckhart Date 6ENFORM-019-R8.2 (02/12/2020) 1 Section I - INTRODUCTION Nevada Oil, LLC / Duke Tank Battery (ARU002305 / CWA) Inspection Date 04/17/2025 PURPOSE OF THE INSPECTION EPA Region 6 inspectors Kerri McCabe (lead), Michael Blaha, and Uma Lad arrived at the Nevada Oil, LLC / Duke Tank Battery ("facility") located from State Highway 82 E, left on Old Strong Highway (Union County Road 39), right on Sandy Bend Road, and then right onto an oilfield lease road at 33.156967, 92.404000 in Strong (Sandy Bend Community), Union County, Arkansas; at 1745 on 04/17/2025 for an unannounced inspection.

Cortnie Pool of TCEQ as this was a joint inspection with EPA lead.

By aligning our efforts, we can support and amplify the endeavours of vanguard businesses committed to leading the transition towards atoxic-free, resource-preservingandclimate positivefuture.

Unpermitted Date Application Submitted: Unpermitted facility facility Latitude: 40.716255N Longitude: -111.906443W Receiving Water(s): Unnamed, unclassified Acreage: approximately 1.7 acres catchments within the South Salt Lake City MS4 thence to the Jordan River Regulatory Inspector's source of information: Facility observations Areas Evaluated During Inspection Permit Self-Monitoring Program Records Compliance Schedule Pollution Prevention Stormwater Facility Site Review Laboratory No Exposure Effluent/Receiving Waters Operations and Maintenance Other: Flow Measurement Sludge Handling/Disposal Other: Contact Information Name(s)/Title Facility Contacts: Primary lead David Augason / Operations Manager / European Marble and Granite / and present during inspections Primary lead and present during the inspection.

This also leads to a new extensive testing and requalification process, which can be complicated and time-consuming.

As we grow 3M, we will lead in environmental stewardship, social equity and justice, and corporate governance, said 3M chairman and CEO Mike Roman.

EPA Region 8 NPDES Inspection Report - WWTF National Database Information Inspection Date: August 11, 2022 Inspection Type: Reconnaissance Inspection Entry / Exit Time: 12:00 PM / 12:45 PM NPDES ID Number: MTU000717 Major / Non-Major Facility: Non-Major Program Sector(s): WWTF (PrivatelyOwned) NAICS Code: 221320 (Sewage Treatment Facilities) Inspection ID: 202208_MTU000717 Lead inspector and affiliation: Akash Johnson / U.S.

This leads to low spare parts consumption and service requirements.

Page 3 of 5 Plant 1 also houses the lead acid battery recharging station (Photo 35), enabling two forklifts to be recharged at a given time.

Therefore, similar to 1), this leads to an increase in waste due to a decrease in service life.

Photo Log Page 4 of 4 APPENDIX 1: Photo Log All photos listed below were taken by Lead EPA Inspector, Ray Andrews, at the time of the inspection.

The limits for Lead and Zinc are hardness dependent as described in Section 8.Q.6 of the Permit.

The permit also states that the facility must monitor for lead unless they certify during the submittal of their monitoring reports that lead sheath belts were not produced during the reporting period.

Welch's lead B&R operator has a RETA CIRO-certification.