August 28, 2025 TRANSMITTED VIA E-MAIL Andrea Peters, DMRQA Coordinator Equistar Chemicals, LP and LyondellBasell Acetyls, LLC P.O.

REGION 6 DALLAS, TX 75270 March 5, 2026 TRANSMITTED VIA E-MAIL Billy Graham Cotton County Rural Water District #2 Walters, OK 73572 drodriguez@ccrwd2.us Re: PWS ID Number: OK2001702 Administrative Order, Docket Number: SDWA-06-2026-1215 Dear DGraham: Enclosed is an Administrative Order (AO) issued by the United States Environmental Protection Agency (EPA) to the Cotton County Rural Water District #2.

U.S.

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION 6 1201 ELM STREET, SUITE 500 DALLAS, TEXAS 75270-2102 June 1,2021 TRANSMITTED VIA EMAIL Jarel LaPan Hill City Manager City of Santa Fe P.O.

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION6 1201 ELM STREET, SUITE 500 DALLAS, TEXAS 75270-2102 May 31, 2022 TRANSMITTED VIA E-MAIL The Honorable Cathy Skurow Mayor ofPortland 1900 Billy G.

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGIONS 1201 ELM STREET, SUITE 500 DALLAS, TEXAS 75270-2102 CERTIFIED MAIL #: May 26, 2023 7016 3010 DODO 4985 1845 Mr.

REGION 6 DALLAS, TX 75270 :3, 2024 TRANSMITTED VIA EMAIL The Honorable David Streeter Mayor, City of Hamburg Hamburg Waterworks 305 E.

Well Inspection Osage DNR / Environmental Protection Agency 1201 Elm Street, Suite 500 Dallas, Texas 75270 Inspector Matthew Allen Inspection Date 10/01/2024 Time 09:00 Operator Representative Helmer Oil Corp.

Region 6 - Enforcement & Compliance Assurance Division INSPECTION REPORT Inspection Date(s): Media Program: Regulatory Program(s) 12/12/2023 Water Clean Water Act Company Name: Facility Name: Facility Physical Location: (city, state, zip code) Mailing address: (city, state, zip code) County/Parish: Facility Phone Number Facility Contact: Jamie Oil, Inc.

Region 6 - Enforcement & Compliance Assurance Division INSPECTION REPORT Inspection Date(s): Media Program: Regulatory Program(s) 12/11/2024 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: Merit Energy Company, LLC McVey 1-13 Tank Battery In Alma from Highway 64 E, then Sharp Chapel Rd, then Red Hill Rd, continue onto Denman Rd, off a gas lease road at 35.458974, -94.141469.

Inspector Well Inspection Osage DNR / Environmental Protection Agency 1201 Elm Street, Suite 500 Dallas, Texas 75270 Matthew Allen Inspection Date 12/18/2024 Time 08:00 Operator Representative 4D Oil & Gas, LLC Operator Info 4D Oil & Gas, LLC 532 Kihekah Pawhuska, OK 74056 Phone: 580-541-5802 Inventory ID API Well No Lease Name Well ID OS5447000 BLUE STEM 3-36 Location NW 36 26N 08E Status Inactive Well Type Disposal Latitude 36.689975 Longitude -96.399951 Inspection Plugging Witnessed Reason Responsible Company at 4D Oil & Gas, LLC Time of Inspection Inspect No.

Region 6 - Enforcement & Compliance Assurance Division INSPECTION REPORT Inspection Date(s): Media Program: Regulatory Program(s) 03/05/2025 Water, Clean Water Act National Pollutant Discharge Elimination System (NPDES) (Brine) Company Name: Facility Name: Facility Physical Location: (city, state, zip code) Mailing address: (city, state, zip code) County/Parish: Facility Phone Number Facility Contact: Contango Resources, LLC Fanny Lease 36.799176, -96.661584 Shidler, Oklahoma 74652 1300 Greenbriar Place Oklahoma City, Oklahoma, 73159 Osage County 918-392-3396 Mike Alkire Michael.Alkire@contango.com Field Supervisor FRS Number: Identification/Permit Number: Media Identifier Number: NAICS: SIC: n/a OKU002214 n/a 211111 1311 Personnel participating in inspection: Matthew Allen EPA Region 6 ECDW Inspector EPA Lead Inspector Signature/Date Supervisor Signature/Date MATTHEW ALLEN Date: 2025.03.26 11:41:10 -05'00' Digitally signed by MATTHEW ALLEN Matthew Allen Date JEANNE ECKHART Date: 2025.04.02 11:05:37 -05'00' Digitally signed by JEANNE ECKHART Jeanne Eckhart Date 6ENFORM-019-R8.2 (02/12/2020) 1 Section I - INTRODUCTION Contango Resources, LLC / Fanny Lease (OKU002214) Inspection Date 03/05/2025 PURPOSE OF THE INSPECTION EPA Region 6 inspector Matthew Allen arrived at the Contango Resources, LLC / Fanny Lease (EPA ID No.

Region 6 - Enforcement & Compliance Assurance Division INSPECTION REPORT Inspection Date(s): Media Program: Regulatory Program(s) 06/15/2023 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: San Felipe Pueblo San Felipe Pueblo Wastewater Treatment Plant (WWTP) 76 Taos Road San Felipe Pueblo, Sandoval County, New Mexico Post Office Box 4219 San Felipe Pueblo, New Mexico 87121 Sandoval (505) 771-6628 Pinu'u Stout Director Department of Natural Resources pstout@sfpueblo.com FRS Number: Identification/Permit Number: Media Identifier Number: NAICS: SIC: 110037117679 NM0031011 NA 221320 4952 Personnel participating in inspection: Pinu'u Stout San Felipe Pueblo Paul Kennedy Chris Lopez James Leija David A.

Region 6 - Enforcement & Compliance Assurance Division INSPECTION REPORT Inspection Date(s): Media Program: Regulatory Program(s) 04/24/2025 Water CWA, 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: City of Bossier City Red River WWTP 3512 Barksdale Blvd. (32.483616, -93.682951) Bossier City, LA 71171 P.O.

Region 6 Compliance Assurance and Enforcement Division INSPECTION REPORT Inspection Date(s): Media: Regulatory Program(s) Company Name: Facility Names: Facility Physical Locations: (city, state, zip code) Mailing address: (city, state, zip code) County/Parish: Facility Contact: 6/25/2025 Water Clean Water Act Brushy Creek Regional Wastewater System - East Brushy Creek Regional Wastewater System - East 3939 Palm Valley BLVD Round Rock, TX 78665 221 East Main Street Round Rock, TX 78664 Williamson Craig Morgan Mayor 512-218-5400 FRS Number: Identification/Permit Number: Media Number: NAICS: SIC: TX0101940 4952 Personnel participating in inspection: Michael Williams EPA/ 6EN-WMH John Heaps City of Round Rock Alex Gonzalez City of Round Rock Inspector Superintendent Operation Supervisor 281-983-2150 512-218-2000 512-218-2000 EPA Lead Inspector Signature/Date Supervisor Signature/Date MICHAEL WILLIAMS 2025.08.13 14:10:44 -05'00' MICHAEL WILLIAMS Michael D.