Document 9Lk3mDLvj9enY98GZwDdeKGZR

UST Inspection Report Allstop Date of Report: Inspection Date & Time: Weather: Facility Owner: Facility Owner Address: October 17, 2024 September 11, 2024, at 10:55 a.m. Central Daylight Time (CDT) Sunny, 80 degrees Fahrenheit P.O. Box 21 Mission, South Dakota 57555 Facility Address: 311 Frontage Road (BIA Hwy 1) Rosebud, South Dakota 57570 Facility Phone: Facility Representative: EPA Facility ID Number: Reason for Inspection: Inspection Team: 4080030 Routine compliance inspection Inspector, EPA UST Program Inspector, EPA UST Program Rosebud Sioux Tribe UST Coordinator UST System Description The Allstop (Facility) is a privately-owned gas station and convenience store located in Rosebud, South Dakota. The fuel at this Facility is sold to the public. The Environmental Protection Agency's Facility records indicate that the Facility has two STI-P3 underground storage tanks (UST) that were installed in November 1999. Tank 1 has a 12,000-gallon capacity and Tank 2 has a 6,000-gallon capacity. Both tanks store gasoline. Piping for all tanks is pressurized, double-walled flex plastic and was upgraded in 2013 along with the dispensers, according to the Facility representative. Inspection Narrative On September 11, 2024, the EPA UST program personnel conducted an inspection at Allstop in Rosebud, South Dakota. The EPA last inspected the Facility on August 4, 2021, and they selected it for routine re-inspection. Ms. spoke with the Facility representative, and sent a follow-up email, on August 23, 2024, to schedule the inspection and provide inspection details (see Attachment A). 4080030-Allstop Page 1 of 3 9/11/2024 UST Inspection The inspection team arrived at the Facility at 10:55 a.m. CDT and were met by the Facility representative. Ms. introduced herself and presented inspector credentials. Ms. filled out a Notice of Inspection (NOI) (see Attachment B) and requested a signature from the Facility representative. Ms. explained that the NOI serves as documentation of consent for the EPA to conduct an inspection. In addition, she said that she would provide the NOI to the Facility at the end of the inspection. EPA inspectors conducted a physical inspection of the UST system as well as a review of Facility records. Photographs of UST system components taken during the inspection are in Attachment C. Copies of operation and maintenance records are in Attachment D. Tank Leak Detection Tank leak detection is conducted by a Tank Sentinel (TS) 750 automatic tank gauge (ATG), which performs 0.2 gph leak tests using the in-tank probe. 30-day leak test records from October 2023 to September 2024 were maintained onsite at the time of the inspection. The February-March 2023 tests were invalid for Tank 1 due to a documented probe issue, which was later resolved. Annual operability testing of the ATG console was conducted and passed on November 6, 2023. Piping Leak Detection Piping leak detection is satisfied by mechanical line leak detectors (MLLD) and annual line tightness testing. Additionally, sump sensors in each tank top sump and under dispenser containment (UDC) sump continuously monitor for leaks in the double-walled piping. Records of annual line tightness testing and annual line leak detector testing were available onsite, showing passing tests conducted on November 6, 2023. Cathodic Protection Cathodic protection (CP) testing for the tanks was conducted and passed on November 6, 2023, and on August 3, 2021. Both records were maintained onsite. Periodic Testing/Inspection of Spill and Overfill Prevention Equipment Triennial testing records of spill buckets and overfill prevention devices (flapper valves) were maintained onsite. The tests were conducted and passed on November 6, 2023. Periodic Operation & Maintenance (O&M) Walkthrough Inspections Records of monthly walkthrough inspections from September 2023 to August 2024 were provided at the time of inspection, except for December 2023, which was not documented. An annual walkthrough inspection was conducted and documented on November 15, 2023. Operator Training A certificate for Class A/B operator training was maintained onsite at the time of inspection. Additionally, EPA records include a Class A/B certificate for a second individual. No class C documentation was available at the time of inspection. 4080030-Allstop Page 2 of 3 9/11/2024 UST Inspection