UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION 6 1201 ELM STREET, SUITE 500 DALLAS, TEXAS 75270-2102 January 5, 2021 VIA EMAIL: robert.sheninger@talosenergy.com Mr.

EPA Inspection Report - Page 1 of 15 Region 6 - Enforcement & Compliance Assurance Division INSPECTION REPORT Inspection Date(s): Media Program: Regulatory Program(s) 04/13/2022 Air SIP, Title V, NESHAP, NSPS Company Name: Facility Name: Facility Physical Location: (city, state, zip code) Mailing address: (city, state, zip code) County/Parish: Facility Phone Number Facility Contact: Westlake Styrene LP Styrene Marine Terminal 1820 Pak Tank Rd Sulphur, LA, 70665 PO Box 2449 Sulphur, LA, 70664 Calcasieu Parish 337-583-6428 Heather Lechtenberg FRS Number: Identification/Permit Number: Media Identifier Number: NAICS: SIC: 110002347540 AI#: 17904 / 0520-00156-V4 2201900156 424690, 483211 5169 Personnel participating in inspection: James Haynes EPA ECD-AT Ben Rosenthal EPA ECD-AT DeWayne Coffman Westlake Styrene LP Michell Gill Westlake Styrene LP Charlie McGee Westlake Styrene LP Tom Hunt Westlake Styrene LP Engineer, Air Inspector Inspector Air Engineer Water Specialist Operator Production Superintendent EPA Lead Inspector Signature/Date BENJAMIN ROSENTHAL Digitally signed by BENJAMIN ROSENTHAL DN: c=US, o=U.S.

DOCKET NO.

May 13, 2025 TRANSMITTED VIA EMAIL Mr.

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION 6 1201 ELM STREET, SUITE 500 DALLAS, TEXAS 75270-2102 January 19, 2023 TRANSMITTED VIA E-MAIL Mr.

December 13, 2023 TRANSMITTED VIA E-MAIL Tommy Merck, Wastewater Treatment Operator Montgomery County Municipal Utility District No. 119 1300 Post Oak Boulevard, Suite 1400 Houston, Texas 77056 tommy.merck@inframark.com Re: Administrative Order; Docket Number: CWA-06-2024-1707 Montgomery County MUD 119 TPDES Permit Number: TX0128295 Dear Mr.

REGION 6 DALLAS, TX 75270 May 24, 2024 TRANSMITTED VIA E-MAIL Clint Penrose Braskem America Inc. 8811 Strang Road La Porte, TX 77571 clint.penrose@braskem.com RE: Administrative Order; Docket Number: CWA-06-2024-1752 TPDES Permit Number: TX0074276 Dear Mr.

Region 6 - Enforcement & Compliance Assurance Division INSPECTION REPORT Inspection Date(s): Media Program: Regulatory Program(s) Company Name: Facility Name: Facility Physical Location: (city, state, zip code) Mailing address: (city, state, zip code) County/Parish: Facility Phone Number Facility Contact: 06/27/2024 Water, Clean Water Act (Brine) Brine (NPDES) CapturePoint, LLC North Burbank Unit (NBU) 57 Battery 36.784534, -96.739868 Webb City, Oklahoma, 74652 1833 S.

Well Inspection Osage DNR / Environmental Protection Agency 1201 Elm Street, Suite 500 Dallas, Texas 75270 Inspector Matthew Allen Inspection Date 10/02/2024 Time 13:40 Operator Representative Calgary Energy, LLC Operator Info Calgary Energy, LLC 4444 E. 146th St.

Region 6 - Enforcement & Compliance Assurance Division INSPECTION REPORT Inspection Date(s): Media Program: Regulatory Program(s) August 26 - 28, 2024 Clean Water Act National Pollutant Discharge Elimination System (NPDES) Company Name: Facility Name: Facility Physical Location: (city, state, zip code) Mailing address: (city, state, zip code) County/Parish: Facility Phone Number Facility Contact: BP Exploration and Production, Inc.

Region 6 - Enforcement & Compliance Assurance Division INSPECTION REPORT Inspection Date(s): Media Program: Regulatory Program(s) 11/08/2024 Water (CWA) Water (CWA) Brine Program (Oil & Gas inspection) Company Name: Facility Name: Facility Physical Location: (city, state, zip code) Mailing address: (city, state, zip code) County/Parish: Facility Phone Number Facility Contact: SMI Operating Company, LLC E Gregory #4 Tank Battery In Old Union from Highway 63 N, then Armer Rd, and left onto an oil lease road at 33.246617, -92.536917.

Region 6 - Enforcement & Compliance Assurance Division INSPECTION REPORT Inspection Date(s): Media Program: Regulatory Program(s) 01/15/2025 Water (CWA) Water (CWA) Brine Program (Oil & Gas inspection) Company Name: Facility Name: Facility Physical Location: (city, state, zip code) Mailing address: (city, state, zip code) County/Parish: Facility Phone Number Facility Contact: Capstone Oilfield Disposal of Arkansas, LLC Bohannon No. 4 SWDS Tank Battery In Van Buren from Interstate 540, then Highway 59, then left onto a gas lease road at 35.393519, -94.331609.

Inspector Well Inspection Osage DNR / Environmental Protection Agency 1201 Elm Street, Suite 500 Dallas, Texas 75270 Matthew Allen Inspection Date 04/09/2025 Time 11:20 Operator Representative Contango Resources, LLC Operator Info Contango Resources, LLC 1717 South Boulder, Suite 900 Tulsa, OK 74119 Phone: 918-392-3396 Inventory ID API Well No Lease Name Well ID OS5907000 MASON 1 Location NW 32 25N 06E Status Inactive Well Type Disposal Latitude 36.605507 Longitude -96.683142 Inspection Requested By Compliance Reason Staff Responsible Company at Contango Resources, LLC Time of Inspection Inspect No.

July 30, 2025 TRANSMITTED VIA EMAIL Jeremy Dugas Environmental Supervisor GOM Shelf, LLC 2107 Research Forrest Drive, Suite 250 The Woodlands, Texas 77380 jeremy.dugas@commodoreoffshore.com Re: Notice of Potential Violation and Opportunity to Confer NPDES Permit: GMG290235 Dear Mr.

Region 6 - Enforcement & Compliance Assurance Division INSPECTION REPORT Inspection Date(s): Media Program: Regulatory Program(s) 09/17/2025 Water NPDES Company Name: Facility Name: Facility Physical Location: (city, state, zip code) Mailing address: (city, state, zip code) County/Parish: Facility Phone Number Facility Contact: Laguna Development Corporation Casa Blanca Wastewater Treatment Plant (WWTP) Southeast of the intersection of Interstate 40 (I-40) and Casa Blanca Road (aka Indian Service Route #23) Pueblo of Laguna, Cibola County, New Mexico 14500 Central Avenue SW Albuquerque, New Mexico 87121 Bernalillo 505-463-0873 Glenn Trotter Level 2 Operator gtrotter@POLDC.com FRS Number: Identification/Permit Number: Media Identifier Number: NAICS: SIC: 110020039340 NM0030678 N/A 221320 4952 Personnel participating in inspection: Glen Trotter Casa Blanca/Rio Puerco WWTP David A.