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Region 6 - Enforcement & Compliance Assurance Division INSPECTION REPORT Inspection Date(s): Media Program: Regulatory Program(s) 07/30/2025 Water Clean Water Act-National Pollution Discharge Elimination System (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: H.R. Collier Osage Happy Hollow Lease Latitude: 36.571869, Longitude: -96.422065 Pawhuska, OK, 74056 644 North Quawpaw Skiatook, OK, 74070 Osage County, OK 918-381-2263 Denton Collier Owner dmc2263@gmail.com FRS Number: Identification/Permit Number: Media Identifier Number: NAICS: SIC: n/a OKU002220 n/a 211111 1311 Personnel participating in inspection: Matthew Allen EPA/Region 6 ECDW Thad Wells Company Representative Inspector Pumper EPA Lead Inspector Signature/Date Supervisor Signature/Date MATTHEW ALLEN Date: 2025.09.08 10:21:09 -05'00' Digitally signed by MATTHEW ALLEN Matthew Allen Date JEANNE ECKHART Date: 2025.09.09 06:10:47 -05'00' Digitally signed by JEANNE ECKHART Jeanne Eckhart Date 6ENFORM-019-R8.2 (02/12/2020) 1 H.R. Collier / Osage Happy Hollow Lease (CWA) Inspection Date 07/30/2025 Section I - INTRODUCTION PURPOSE OF THE INSPECTION EPA Region 6 Inspector, Matthew Allen, arrived at the H.R. Collier - Osage Happy Hollow Lease (EPA ID No. OKU002220) at 10:30 PM on 07/30/2025 for a site inspection in response to a spill report (NRC# 1438334). The inspection was conducted by the authority of the Clean Water Act (CWA) to determine compliance with Environmental Protection Agency (EPA) regulations. Thad Wells, serving as the company representative, was present during the inspection. There was no other federal, state, or local agency representative present at the time of the inspection. FACILITY DESCRIPTION EPA conducted an inspection at the H.R. Collier, Osage Happy Hollow lease where a ruptured poly flowline released a company estimated 5 barrels of crude oil and 1 barrel of saltwater to the land surface. Spill impacts migrated to a nearby unnamed tributary of Little Hominy Creek and travelled generally south, ultimately impacting Little Hominy Creek. Section II - OBSERVATIONS I observed the release point of the spill which was a 2" poly production flowline which ruptured during a startup procedure. See photo No. 1. For additional GPS location information and photo metadata, please see Appendix 1 (photo log) attached to this report. I observed the point of entry (POE) into the unnamed tributary of Little Hominy Creek. At the time of the inspection the tributary was dry at the POE. See photo No. 2. Approximately mile downstream from the POE into the unnamed tributary, I observed a TDS field reading of 2,999 mg/L at the first pool of water available for observance. This was the highest observed TDS field reading of the inspection. At this same location, a small amount of oil was floating on the surface of the water. See photo No. 3 and 4. Cleanup was underway at the time of the inspection. Industrial absorbent material, absorbent pads and absorbent booms were being used to remove oil from the impacted areas. Continuing approximately 800 feet downstream, near the confluence of the unnamed tributary and Little Hominy Creek, I observed a TDS field reading of 2,543 mg/L. A small amount of oil was continuing to migrate down the unnamed tributary at the time of the inspection. See photos No. 5 and 6. Immediately upstream from the confluence of the impacted tributary and Little Hominy Creek, I observed a TDS field reading of 527 mg/L. This reading was observed in an area which was not impacted 2 H.R. Collier / Osage Happy Hollow Lease (CWA) Inspection Date 07/30/2025 by the spill and should be considered when establishing background TDS levels for the area. See photo No. 7. At the point of entry (POE) into Little Hominy Creek, I observed a TDS field reading of 504 mg/L. See photo No. 8. Approximately 150 feet downstream from the POE, I observed oil on Little Hominy Creek and a floating containment boom which was placed by the operator to prevent downstream migration of spill impacts. At the time of the inspection, the boom was properly installed and was preventing downstream migration of the oil. This was the end of the observed spill impacts. Section III - AREAS OF CONCERN The primary area of concern was the oil present along the impacted tributary and Little Hominy Creek. Additional areas of concern included the elevated TDS measurements observed along the impacted tributary and the spill impacts to soil and vegetation along the overland portion of the spill path. Section IV - FOLLOW UP EPA conducted a follow up inspection on 8/4/2025. EPA inspector will conduct follow-up calls, field meetings and inspections to ensure the impacted area is returned to "pre-spill" condition. Section V - LIST OF APPENDICES Appendix 1 - Photo Log - 9 photos taken 7/30/2025 3 H R Collier/Osage Happy Hollow Lease (OKU002220) Inspection Date: 7/30/2025 Appendix 1 Photograph Log 9 Photos UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Photograph Log Location: 36.571869, -96.422065 City: Hominy Photo No. 1 County/Parish: Osage State: Oklahoma Photo File Name: R0010723 Orientation: N/A Date of Photo: 7/30/2025 Time of Photo: : 10:31AM Latitude: 36.571869 Longitude: -96.422065 Photographer: Matthew Allen Description: This was the release point of the spill, a 2" poly flowline carrying produced water/oil. UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Photograph Log Location: 36.571869, -96.422065 City: Hominy Photo No. 2 County/Parish: Osage State: Oklahoma Photo File Name: R0010724 Orientation: SSW Date of Photo: 7/30/2025 Time of Photo: : 10:34AM Latitude: 36.571769 Longitude: -96.421935 Photographer: Matthew Allen Description: This was the point of entry (POE) into the unnamed tributary of Little Hominy Creek. The tributary was dry at this location. UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Photograph Log Location: 36.571869, -96.422065 City: Hominy Photo No. 3 County/Parish: Osage State: Oklahoma Photo File Name: R0010725 Orientation: N/A Date of Photo: 7/30/2025 Time of Photo: : 10:42AM Latitude: 36.570135 Longitude: -96.423526 Photographer: Matthew Allen Description: A TDS field reading of 2,999 mg/L was observed at the first pool of water downstream from the POE in the unnamed tributary of Little Hominy Creek. UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Photograph Log Location: 36.571869, -96.422065 City: Hominy Photo No. 4 County/Parish: Osage State: Oklahoma Photo File Name: R0010726 Orientation: SSW Date of Photo: 7/30/2025 Time of Photo: : 10:44AM Latitude: 36.570135 Longitude: -96.423526 Photographer: Matthew Allen Description: This was the first pool of water downstream from the POE, the same location where the TDS field reading from photo No. 3 was observed. A small amount of oil was floating on the pool of water. UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Photograph Log Location: 36.571869, -96.422065 City: Hominy Photo No. 5 County/Parish: Osage State: Oklahoma Photo File Name: R0010727 Orientation: WSW Date of Photo: 7/30/2025 Time of Photo: : 10:54AM Latitude: 36.567889 Longitude: -96.423978 Photographer: Matthew Allen Description: This was a TDS field reading of 2,543 mg/L observed in the unnamed tributary immediately upstream from the confluence with Little Hominy Creek. UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Photograph Log Location: 36.571869, -96.422065 City: Hominy Photo No. 6 County/Parish: Osage State: Oklahoma Photo File Name: R0010728 Orientation: SSW Date of Photo: 7/30/2025 Time of Photo: : 10:55AM Latitude: 36.567889 Longitude: -96.423978 Photographer: Matthew Allen Description: This was a view along the unnamed tributary looking toward the POE into Little Hominy Creek. Elevated TDS and oil were present at the location. UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Photograph Log Location: 36.571869, -96.422065 City: Hominy Photo No. 7 County/Parish: Osage State: Oklahoma Photo File Name: R0010729 Orientation: N/A Date of Photo: 7/30/2025 Time of Photo: : 10:57AM Latitude: 36.567889 Longitude: -96.423978 Photographer: Matthew Allen Description: This was a TDS field reading of 527 mg/L taken immediately upstream from the POE into Little Hominy Creek. This reading should be used when considering background TDS levels for the area. UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Photograph Log Location: 36.571869, -96.422065 City: Hominy Photo No. 8 County/Parish: Osage State: Oklahoma Photo File Name: R0010730 Orientation: N/A Date of Photo: 7/30/2025 Time of Photo: : 11:02AM Latitude: 36.567809 Longitude: -96.423939 Photographer: Matthew Allen Description: This was a TDS field reading of 504 mg/L taken at the POE into Little Hominy Creek. UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Photograph Log Location: 36.571869, -96.422065 City: Hominy Photo No. 9 County/Parish: Osage State: Oklahoma Photo File Name: R0010731 Orientation: WNW Date of Photo: 7/30/2025 Time of Photo: : 11:15AM Latitude: 36.566515 Longitude: -96.422840 Photographer: Matthew Allen Description: This was an absorbent containment boom placed in Little Hominy Creek by the operator to prevent downstream migration of spill impacts. Oil was present on Little Hominy Creek which can be seen on the right half of the photo. At the time of the inspection, the boom was properly installed and preventing downstream migration of oil. This was the end of observed spill impacts.