Document M4Kd8mownpkK8Z5oGV8nN4Eyy

UST Inspection Report Dakota Connection Date of Report: Inspection Date & Time: Weather: Facility Owner: Facility Owner Address: June 18, 2025 May 20, 2025, at 10:00 a.m. Central Daylight Time (CDT) Rainy, 50 degrees Fahrenheit Sisseton Wahpeton Oyate Tribe 12554 BIA Hwy 711 Agency Village, SD 57262 Facility Address: 46102 SD Hwy 10 Sisseton, SD 57262 Facility Representative: EPA Facility ID Number: Reason for Inspection: Inspection Team: 4030025 Routine compliance inspection Marta Grabowski, Inspector, EPA UST Program UST System Description The Dakota Connection (Facility) is a Tribally-owned gas station and casino located on the Lake Traverse Reservation in Sisseton, South Dakota. The fuel at this Facility is sold to the public. The Environmental Protection Agency's Facility records indicate the Facility has five, single-walled, fiberglass reinforced plastic (FRP) underground storage tanks (UST) that were installed in June 1995. Tank names, capacities, and products are listed in the table below. Piping for all tanks is pressurized, double-walled flex plastic. Two new product lines from Tanks 3-5 to Dispensers 1-8 were installed in 2024 along with four new under dispenser containment (UDC) sumps. Additionally, Tank 3 and Tank 4 were manifolded together at that time. Tank Number 1 2 3 (manifolded) 4 (manifolded) 5 Product stored Unleaded 87 gasoline Diesel Regular unleaded gasoline Regular unleaded gasoline Premium gasoline Tank Capacity (gallons) 15,000 15,000 15,000 10,000 10,000 Inspection Narrative On May 20, 2025, the EPA UST program personnel conducted an inspection at Dakota Connection in Sisseton, South Dakota. The EPA last inspected the Facility on May 3, 2022, and they selected it for 4030025-Dakota Connection Page 1 of 3 5/20/2025 UST Inspection routine re-inspection. Ms. Grabowski, the EPA inspector, spoke with the Facility representative on April 15, 2025, and she sent a follow-up on April 16, 2025, to schedule the inspection and provide inspection details (see Attachment A). Ms. Grabowski arrived at the Facility at 10:00 a.m. CDT along with and from the Tribal environmental department. Ms. Grabowski introduced herself to the Facility operator, , and presented inspector credentials. Ms. Grabowski proceeded to conduct 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 B. Copies of operation and maintenance records are in Attachment C. Tank Leak Detection Tank leak detection is conducted by a Veeder Root TLS 350 automatic tank gauge (ATG), which performs continuous statistical leak detection (CSLD) via probes in each tank. Records of release detection tests from the ATG were not maintained onsite or otherwise available during the inspection, except for passing results on May 20th, which the EPA inspector printed while onsite. Annual operability testing for the ATG console and probes was conducted and passed on April 29, 2025. Piping Leak Detection For piping associated with the Unleaded 87 and the Diesel (Tanks 1 and 2), piping leak detection is satisfied by electronic line leak detectors (ELLD), which perform annual 0.1 gph line tightness tests. Records of piping release detection tests were not maintained onsite; however, the EPA inspector printed pressure line leak test results from the ATG console at the time of inspection. Between December 13, 2024, and December 18, 2024, each line has a passing 0.1 gph result. Tank 3 and Tank 4 are manifolded together, and only one ELLD is connected (Q4). Annual operability testing for the ELLDs was conducted and passed on April 29, 2025. For the Regular unleaded and Premium lines (Tanks 3-5), records of UDC sump sensor testing and hydrostatic testing of containment sumps were not available onsite. Additionally, Tanks 3-5 submersible turbine pump (STP) sumps were not equipped with sensors. Cathodic Protection Cathodic protection (CP) is not required at the Facility. The portion of tanks and piping that are in contact with soil are constructed from non-corrodible materials. Periodic Testing/Inspection of Spill and Overfill Prevention Equipment Triennial testing records for spill buckets and overfill prevention devices (flapper valves) were provided to the EPA inspector. All spill buckets and flapper valves passed testing on April 29, 2025. Periodic Operation & Maintenance (O&M) Walkthrough Inspections Records of monthly walkthrough inspections were available onsite for the previous 12 months; however, the release detection tasks were not initialed in 2024. No annual walkthrough inspection checklist was provided. On May 23, 2025, the EPA inspector emailed a blank combined monthly/annual walkthrough checklist to the Facility operator. 4030025-Dakota Connection Page 2 of 3 5/20/2025 UST Inspection Operator Training Operator training certificates were not available onsite at the time of inspection. Mr. provided a printed agenda from the South Dakota A/B training course. Class C operator training documentation was not available during the inspection. On May 23, 2025, the EPA inspector emailed a blank Class C training form to the Facility. Financial Responsibility In South Dakota, financial coverage for regulated UST systems is provided through the South Dakota Petroleum Release Compensation Fund. Each UST facility is responsible for the deductible. A Facility representative emailed a copy of the South Dakota Certificate of Financial Assurance for Petroleum Underground Storage Tanks after the inspection on May 20, 2025. Physical Observations The EPA inspector viewed the spill buckets/fill pipes, UDC sumps for dispensers 1/2, 3/4, 5/6, and 7/8, tank top sumps, one ATG riser, and the ATG console. The Tank 4 spill bucket contained liquid. No sensors were present in the tank top sumps, but dispensers 1-8 each had a sensor in the UDC. At the time of inspection, the UDC sensor in dispenser 5/6 was not positioned at the lowest point of the sump. On May 28, 2025, the Facility representative emailed photos showing that the sensor had been properly repositioned. Inspection Conclusions and Recommendations At the end of the inspection, the EPA inspector filled out an Onsite Deficiency Identification Form (see Attachment D), which represents initial compliance recommendations at the time of the inspection. On May 28, 2025, a Facility representative emailed several photographs, as mentioned in the above paragraph. Prior to departing the Facility, Ms. Grabowski stated that a full inspection report would be forthcoming, which includes the inspection checklist (see Attachment E). Ms. Grabowski provided the Facility representative with the deficiency form and retained a carbon copy for recordkeeping. Inspection Report Attachments A. Record of communication for scheduling the inspection B. Photo log C. Facility O&M Documents D. Onsite Deficiency Identification Form E. Inspection checklist Signature Lead Inspector MARTA GRABOWSKI Date: 2025.06.18 14:49:21 -06'00' Digitally signed by MARTA GRABOWSKI Marta Grabowski Date of signature 4030025-Dakota Connection Page 3 of 3 5/20/2025 UST Inspection