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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. Dugas: Information currently available to the United States Environmental Protection Agency, Region 6 (EPA) suggests that GOM Shelf, LLC may have committed violations of Section 301 of the Clean Water Act (CWA), 33 U.S.C. 1311 and the National Pollution Discharge Elimination System (NPDES) General Permit for Offshore Activities (GMG290000) at the Permitted Features listed in the Enclosures. By this letter, EPA is extending to you an opportunity to advise EPA, via a conference call or in writing, of any information which EPA should consider with respect to the potential violations. GOM Shelf, LLC owns or operates facilities that discharge pollutants to the waters of the contiguous zone or the ocean under the permit, GMG290235. EPA identified the potential violations in a file review for the monitoring period of May 11, 2023 to May 31, 2025 and in a compliance evaluation inspection conducted by the United States Bureau of Safety and Environmental Enforcement (BSEE) on May 28, 2024. The potential violations are listed in Attachments contained herein. Within 15 calendar days of receipt of this letter, please indicate if you would like to discuss this matter by contacting Uma Lad of my staff at (214) 665-8574 or lad.uma@epa.gov. Sincerely, Bryant Smalley Chief Water Enforcement Branch Notice of Potential Violation and Opportunity to Confer NPDES Permit: GMG290235 Page 2 Enclosures Attachment A - Effluent Violations Attachment B - DMR Non-Receipt Violations Attachment C - BSEE Inspection Violations ec: Judy Triche, Chief, Environmental Monitoring Unit, BSEE judy.triche@bsee.gov Review Period: 05/11/2023 - 05/31/2025 Attachment A Environmental Protection Agency Integrated Compliance Information System (ICIS) Effluent Violations GMG290235 Monitoring Period End Date 09/30/2024 06/30/2024 05/31/2024 02/29/2024 02/29/2024 Monitoring Period From 07/01/2024 to 09/30/2024 From 04/01/2024 to 06/30/2024 From 04/01/2024 to 06/30/2024 From 01/01/2024 to 03/31/2024 From 01/01/2024 to 03/31/2024 Limit Set Area/Block1 Lease Parameter 0247-DD HI, SA-A582 82597 - Deck drainage, free oil 0132-DD MP-153 82597 - Deck drainage, free oil 0243-DD WD-70 82597 - Deck drainage, free oil 0125-PR SMI, SA-149 82599 - Produced water, oil and grease 0125-PR SMI, SA-149 82599 - Produced water, oil and grease Value Type/ Stat. Base C3 MO TOTAL C3 MO TOTAL C3 MO TOTAL C2 MO AVG C3 DAILY MX Reported Limit Value/Units Value/Units 5 days 0 days 1 day 0 days 1 day 0 days 60.8 mg/l 29 mg/l 117 mg/l 42 mg/l 1 HI, SA = High Island, South Addition; MP = Main Pass; WD = West Delta; SMI, SA = South Marsh Island, South Addition Attachment B Environmental Protection Agency Integrated Compliance Information System (ICIS) DMR Non-Receipt Violations GMG290235 Review Period: 05/11/2023 - 05/31/2025 Monitoring Period End Date 06/30/2024 03/31/2024 Monitoring Period From 04/01/2024 to 06/30/2024 From 01/01/2024 to 03/31/2024 Limit Set 0176-SW 0128-MD Lease Area/ Block2 ST, SA-295 MP, S&E -308 Parameter 82605 - Sanitary waste, residual chlorine 04239 - Misc. free oil in Western GOA, OCS 51726 - Critical Dilution 51726 - Critical Dilution 51938 - Miscellaneous Discharge Toxicity [Subsea Discharges] [Americamysis bahia (Mysidopsis bahia)] 51939 - Miscellaneous Discharge Toxicity [Subsea Discharges] [Menidia beryllina] 51940 - Miscellaneous Discharges [Pipeline Brine] [Free Oil] 51941 - Miscellaneous Discharges [Pipeline Brine] [Oil & Grease] 74076 - Flow TOP3E - NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) TOP6J - NOEC Lethal Static Renewal 7 Day Chronic Menidia beryllina TPP3E - NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) TPP6J - NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina NODI Code3 **E** DMR Due Date 08/31/2024 05/31/2024 DMR Submission Date 08/21/2024 Missing 2 ST, SA = South Timbalier, South Addition; MP, S&E = Main Pass, South & East Addition; ST = South Timbalier; GI = Grand Isle; SMI, NA = South Marsh Island, North Addition; SS, SA = Ship Shoal, South Addition 3 Information on DMR Non-Receipt status can be found on here: NPDES DMR Non-Receipt Status Search Help. 03/31/2024 03/31/2024 02/29/2024 02/29/2024 From 01/01/2024 to 03/31/2024 From 01/01/2024 to 03/31/2024 From 01/01/2024 to 03/31/2024 From 01/01/2024 to 03/31/2024 0174-PR 0223-PR 0128-MD 0151-PR ST-49 00010 - Temperature, water deg. centigrade 51954 - Oil & grease, free oil 79834 - Produced water, free oil 82599 - Produced water, oil and grease (Daily Maximum) 82599 - Produced water, oil and grease (Monthly Average) 82600 - Produced water, flow 05/30/2024 Missing GI-47 MP, S&E -308 SMI, NA-268 00010 - Temperature, water deg. centigrade 04239 - Misc. free oil in Western GOA, OCS 51726 - Critical Dilution 51726 - Critical Dilution 51938 - Miscellaneous Discharge Toxicity [Subsea Discharges] [Americamysis bahia (Mysidopsis bahia)] 51939 - Miscellaneous Discharge Toxicity [Subsea Discharges] [Menidia beryllina] 51940 - Miscellaneous Discharges [Pipeline Brine] [Free Oil] 51941 - Miscellaneous Discharges [Pipeline Brine] [Oil & Grease] 74076 - Flow TOP3E - NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) TOP6J - NOEC Lethal Static Renewal 7 Day Chronic Menidia beryllina TPP3E - NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) TPP6J - NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina 00010 - Temperature, water deg. centigrade **E** **E** 05/30/2024 05/31/2024 05/31/2024 05/21/2024 Missing 05/21/2024 02/29/2024 02/29/2024 02/29/2024 02/29/2024 01/31/2024 From 01/01/2024 to 03/31/2024 From 01/01/2024 to 03/31/2024 From 01/01/2024 to 03/31/2024 From 01/01/2024 to 03/31/2024 From 01/01/2024 to 03/31/2024 0151-PR 0151-PR 0170-SW 0174-PR 0128-MD SMI, NA-268 SMI, NA-268 SS, SA-274 ST-49 MP, S&E -308 82599 - Produced water, oil and grease (Daily Maximum) 82599 - Produced water, oil and grease (Monthly Average) 82605 - Sanitary waste, residual chlorine 00010 - Temperature, water deg. centigrade 51954 - Oil & grease, free oil 79834 - Produced water, free oil 82599 - Produced water, oil and grease (Daily Maximum) 82599 - Produced water, oil and grease (Monthly Average) 82600 - Produced water, flow 04239 - Misc. free oil in Western GOA, OCS 51726 - Critical Dilution 51726 - Critical Dilution 51938 - Miscellaneous Discharge Toxicity [Subsea Discharges] [Americamysis bahia (Mysidopsis bahia)] 51939 - Miscellaneous Discharge Toxicity [Subsea Discharges] [Menidia beryllina] 51940 - Miscellaneous Discharges [Pipeline Brine] [Free Oil] 51941 - Miscellaneous Discharges [Pipeline Brine] [Oil & Grease] 74076 - Flow TOP3E - NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) TOP6J - NOEC Lethal Static Renewal 7 Day Chronic Menidia beryllina TPP3E - NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) TPP6J - NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina **E** **E** **E** 05/31/2024 05/31/2024 05/31/2024 05/30/2024 05/31/2024 05/21/2024 05/21/2024 05/17/2024 Missing Missing 01/31/2024 12/31/2023 11/30/2023 From 01/01/2024 to 03/31/2024 From 10/01/2023 to 12/31/2023 From 10/01/2023 to 12/31/2023 0170-SW 0128-MD 0128-MD SS, SA-274 MP, S&E -308 MP, S&E -308 82605 - Sanitary waste, residual chlorine 04239 - Misc. free oil in Western GOA, OCS 51726 - Critical Dilution 51726 - Critical Dilution 51938 - Miscellaneous Discharge Toxicity [Subsea Discharges] [Americamysis bahia (Mysidopsis bahia)] 51939 - Miscellaneous Discharge Toxicity [Subsea Discharges] [Menidia beryllina] 51940 - Miscellaneous Discharges [Pipeline Brine] [Free Oil] 51941 - Miscellaneous Discharges [Pipeline Brine] [Oil & Grease] 74076 - Flow TOP3E - NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) TOP6J - NOEC Lethal Static Renewal 7 Day Chronic Menidia beryllina TPP3E - NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) TPP6J - NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina 04239 - Misc. free oil in Western GOA, OCS 51726 - Critical Dilution 51726 - Critical Dilution 51938 - Miscellaneous Discharge Toxicity [Subsea Discharges] [Americamysis bahia (Mysidopsis bahia)] 51939 - Miscellaneous Discharge Toxicity [Subsea Discharges] [Menidia beryllina] 51940 - Miscellaneous Discharges [Pipeline Brine] [Free Oil] 51941 - Miscellaneous Discharges [Pipeline Brine] [Oil & Grease] 74076 - Flow **E** 05/31/2024 02/29/2024 02/29/2024 05/17/2024 Missing Missing 10/31/2023 09/30/2023 From 10/01/2023 to 12/31/2023 From 07/01/2023 to 09/30/2023 0128-MD 0128-MD MP, S&E -308 MP, S&E -308 TOP3E - NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) TOP6J - NOEC Lethal Static Renewal 7 Day Chronic Menidia beryllina TPP3E - NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) TPP6J - NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina 04239 - Misc. free oil in Western GOA, OCS 51726 - Critical Dilution 51726 - Critical Dilution 51938 - Miscellaneous Discharge Toxicity [Subsea Discharges] [Americamysis bahia (Mysidopsis bahia)] 51939 - Miscellaneous Discharge Toxicity [Subsea Discharges] [Menidia beryllina] 51940 - Miscellaneous Discharges [Pipeline Brine] [Free Oil] 51941 - Miscellaneous Discharges [Pipeline Brine] [Oil & Grease] 74076 - Flow TOP3E - NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) TOP6J - NOEC Lethal Static Renewal 7 Day Chronic Menidia beryllina TPP3E - NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) TPP6J - NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina 04239 - Misc. free oil in Western GOA, OCS 51726 - Critical Dilution 51726 - Critical Dilution 51938 - Miscellaneous Discharge Toxicity [Subsea Discharges] [Americamysis bahia (Mysidopsis bahia)] 51939 - Miscellaneous Discharge Toxicity [Subsea Discharges] [Menidia beryllina] 02/29/2024 Missing 11/30/2023 Missing 08/31/2023 07/31/2023 From 07/01/2023 to 09/30/2023 From 07/01/2023 to 09/30/2023 0128-MD 0041-PR MP, S&E -308 MP, S&E -311 51940 - Miscellaneous Discharges [Pipeline Brine] [Free Oil] 51941 - Miscellaneous Discharges [Pipeline Brine] [Oil & Grease] 74076 - Flow TOP3E - NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) TOP6J - NOEC Lethal Static Renewal 7 Day Chronic Menidia beryllina TPP3E - NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) TPP6J - NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina 04239 - Misc. free oil in Western GOA, OCS 51726 - Critical Dilution 51726 - Critical Dilution 51938 - Miscellaneous Discharge Toxicity [Subsea Discharges] [Americamysis bahia (Mysidopsis bahia)] 51939 - Miscellaneous Discharge Toxicity [Subsea Discharges] [Menidia beryllina] 51940 - Miscellaneous Discharges [Pipeline Brine] [Free Oil] 51941 - Miscellaneous Discharges [Pipeline Brine] [Oil & Grease] 74076 - Flow TOP3E - NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) TOP6J - NOEC Lethal Static Renewal 7 Day Chronic Menidia beryllina TPP3E - NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) TPP6J - NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina 00010 - Temperature, water deg. centigrade **E** 11/30/2023 11/30/2023 Missing 11/14/2023 07/31/2023 From 07/01/2023 to 09/30/2023 0128-MD 04239 - Misc. free oil in Western GOA, OCS MP, S&E -308 51726 - Critical Dilution 51726 - Critical Dilution 51938 - Miscellaneous Discharge Toxicity [Subsea Discharges] [Americamysis bahia (Mysidopsis bahia)] 51939 - Miscellaneous Discharge Toxicity [Subsea Discharges] [Menidia beryllina] 51940 - Miscellaneous Discharges [Pipeline Brine] [Free Oil] 51941 - Miscellaneous Discharges [Pipeline Brine] [Oil & Grease] 74076 - Flow TOP3E - NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) TOP6J - NOEC Lethal Static Renewal 7 Day Chronic Menidia beryllina TPP3E - NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) TPP6J - NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina 11/30/2023 Missing ATTACHMENT C BSEE Inspection Report Violations GMG290235 Permitted Feature 0222 Inspection Date: 05/28/2024 BSEE Inspection ID: 475839113 Records Review Period: 04/01/2022 - 03/31/2024 Lease Area/Block: Grand Isle 43 PF/Limit Set 0222 0222-DW 0222-SW Description of Violations The facility does not have a Best Management Plan (BMP) for containment of waste materials from sandblasting or similar maintenance activities. Washing machines discharge directly to sea and visible foam was witnessed. The facility is unable to chlorinate their bypass line on the marine sanitation device (MSD). Violation Date(s) 05/28/2024 05/28/2024 05/28/2024 Permit Citation Part I, Sec. C, 6 Part I, Sec. B, 9, a Part II, Sec B, 3, a