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Home My WebLink AboutDERR-2025-003402Monitoring Well Decommissioning Report Flying J #746 2025 South 900 West Salt Lake City, Utah Facility ID No: 4000302 Release ID: OFS Prepared for: Utah Department of Environmental Quality Division of Environmental Response and Remediation 195 North 1950 West P.O. Box 144840 Salt Lake City, Utah 84114-4840 Prepared by: 8787 S. Redwood Road, Suite 200 West Jordan, Utah 84088 801-505-9251 www.broadbentinc.com April 30, 2025 Project No. 23-14-112 TABLE OF CONTENTS 1.0 INTRODUCTION ................................................................................................................................. 1 2.0 SITE BACKGROUND SPECIFIC TO THE ‘OFS’ RELEASE AND INITIAL INVESTIGATION ......................... 1 3.0 FIELD ACTIVITIES ................................................................................................................................ 2 4.0 SUMMARY ......................................................................................................................................... 3 5.0 LIMITATIONS ...................................................................................................................................... 3 6.0 REFERENCES....................................................................................................................................... 3 LIST OF FIGURES Figure 1: Site Location Map Figure 2 Site Layout Map LIST OF TABLES Table 1: Monitoring Well Construction Details LIST OF APPENDICES Appendix A: Field Data Sheet Broadbent & Associates, Inc. Monitor Well Decommissioning Report West Jordan, Utah Flying J #746/Salt Lake City April 30, 2025 Page 1 1.0 INTRODUCTION Broadbent & Associates, Inc. (Broadbent) is pleased to present this Monitoring Well Decommissioning Report associated with Flying J Travel Center #746 located at 2025 South 900 West in Salt Lake City, Salt Lake County, Utah (Figure 1). This Site is identified by DERR as Facility Identification No. 4000302 and Release Site OFS associated with a past release of petroleum hydrocarbons. DERR has determined the site meets the criteria for petroleum case closure under the Utah Admin. Code Rule R311-211 and has initiated the closure process for this release. Accordingly, monitoring and remedial wells associated with the petroleum case were decommissioned. This report documents well abandonment field activities. 2.0 SITE BACKGROUND SPECIFIC TO THE ‘OFS’ RELEASE AND INITIAL INVESTIGATION Broadbent mobilized to the Site to initiate abatement measures on October 15, 2022. Based on the initial notification, an estimated 100 gallons of diesel fuel had been released in the UST basin area and adjacent catch basin and sump. The estimate of fuel released was later revised to between 150 to 200 gallons based on recovery volumes and visual observations. Documentation of initial spill response was summarized in Broadbent’s Release OFS Spill Report dated December 17, 2022. In March 2023, Broadbent oversaw the drilling of four soil borings (BH-1 through BH-4, Figure 2) on the perimeter of the underground storage tank (UST) basin in proximity to the release location. Soil samples were field screened for potential volatile organics using a portable photo-ionization detector (PID) but no soil samples were submitted for laboratory analysis. Each boring was advanced into groundwater (encountered at approximate depths ranging from nine [9] to 11 feet below ground surface [bgs]) sufficient to allow the construction of a temporary monitor well. Following low-flow purge activities, groundwater samples were collected at each of the four (4) locations and submitted for laboratory analyses. At the completion of groundwater sampling activities, the temporary well casings were removed, and the four (4) bore holes were backfilled with bentonite grout. Details of the initial characterization effort were documented in Broadbent’s Spill OFS Limited Site Investigation Report dated May 3, 2023. Based on the groundwater analytical results, the report concluded that residual total petroleum hydrocarbons - diesel range organics (TPH-DRO) exceeded the UDEQ Initial Screening Levels (ISLs) in the groundwater sample collected at boring BH-2 (on the north side of the UST basin). No other ISL exceedances were noted. Based on the results of the initial investigation (and with input from DERR), Broadbent returned to the Site in April 2024 to collect additional data to verify the groundwater results observed in the sample collected at BH-2 and to evaluate soil data in the vadose zone. Direct Push Services advanced a total of six (6) borings using direct-push technology. Each boring was drilled to a total depth of approximately 15 feet, with soil samples being collected at approximate depths of five (5) and 10 feet bgs. At the completion of drilling and soil sampling, each boring was completed as a two (2)-inch diameter PVC well with a 10- foot section of slotted casing extending from approximately five (5) feet to 15 feet bgs. In May 2024, Broadbent returned to the Site to gauge depth to water and perform low-flow purge groundwater sampling activities at the six new wells. No ISL exceedances were noted in the submitted soil or groundwater samples collected in April and May 2024. Broadbent & Associates, Inc. Monitor Well Decommissioning Report West Jordan, Utah Flying J #746/Salt Lake City April 30, 2025 Page 2 Quarterly Groundwater monitoring was conducted September 2024. Monitoring well results associated with this release were below regulatory limits and closure was requested for release OFS. In a letter from DERR dated December 18, 2024, No Further Action was granted. 3.0 FIELD ACTIVITIES Decommissioning of monitoring wells MW-7 through MW-12 was conducted on March 19, 2025. A Site Layout Plan depicting well locations is provided as Figure 2. Well construction details are provided in Table 1. Well abandonment activities were conducted in general accordance with Utah Admin. Code R655-4-14. Ground Penetrating Radar (GPR) and other utility locating surveys were conducted by Bloodhound to survey around the wells that were to be destroyed prior to ground disturbing activities. Cascade Drilling, LLC (Cascade), a Utah licensed drilling contractor, provided certified well driller oversight of well abandonment. 3.1 Well Abandonment Activities Release associated monitoring wells were destroyed by backfilling with bentonite from the bottom upwards and bentonite was hydrated. After the sealing was complete, the well vaults and the top two (2) feet of the casing were removed. An asphalt cap was used for surface restoration at each location. No irregularities were reported during the decommissioning of wells associated with the Site. Well Abandonment Reports were not required to be submitted to DWR as the wells were installed at a maximum depth of 15 feet. Field notes documenting well abandonment activities are provided in Appendix A. 4.0 SUMMARY Well abandonment activities were conducted in general accordance with Utah Admin. Code R655-4-14. Six (6) monitoring wells were decommissioned in accordance with DWR requirements in response to the No Further Action Letter from DERR dated December 18, 2024. 5.0 LIMITATIONS The findings presented in this report are based upon: observations of Broadbent field personnel and well abandonment services provided by Cascade. Our services were performed in accordance with the generally accepted standard of practice at the time this report was written. No other warranty, expressed or implied was made. This report has been prepared for the exclusive use of Pilot. It is possible that variations in soil or groundwater conditions could exist beyond points explored in this investigation. Also, changes in site conditions could occur in the future due to variations in rainfall, temperature, regional water usage, or other factors. Broadbent & Associates, Inc. Monitor Well Decommissioning Report West Jordan, Utah Flying J #746/Salt Lake City April 30, 2025 Page 3 6.0 REFERENCES Broadbent & Associates, Inc. 2022. Release OFS Spill Report, Flying J #746, 2025 900 West, Salt Lake City, Utah. Facility ID No: 4000302, Release ID: OFS. December 17. Broadbent & Associates, Inc. 2023. Spill OFS Limited Site Investigation Report, Flying J #746, 2025 900 West, Salt Lake City, Utah. Facility ID No: 4000302, Release ID: OFS. May 3. Broadbent & Associates, 2024. Groundwater Monitoring Report, Flying J Travel Plaza #746, located at 850 West 2100 South, Salt Lake City, Utah. Facility ID No: 4000302, Release ID: OFS. October 25. DERR, 2023. Site Investigation Reporting and Requirements, Flying J Travel Plaza #746, located at 850 West 2100 South, Salt Lake City, Utah. Facility ID No: 4000302, Release ID: OFS. January 12. DERR, 2024. No Further Action, Leaking Petroleum Storage Tank Release, Flying J Travel Plaza #746, located at 850 West 2100 South, Salt Lake City, Utah. Facility ID No: 4000302, Release ID: OFS. December 18. FIGURES Site Location Map Flying J Travel Center #746 2025 South 900 West Salt Lake City, Utah Project No. 23-14-112 Figure Prepared by: JEH Reviewed by: ACM Date: 7/25/24 1 0 SCALE: 1 inch = 4000 feet 4000 8000 LEGEND Site Location S 9 0 0 W Flying J Travel Center W 2100 S Auto Dispenser Canopy Truck Dispenser Canopy USTs MW-7MW-8 MW-10 MW-12 MW-9 MW-4 MW-3 MW-2 MW-5 MW-1 MW-11 MW-13 MW-14 MW-5A Site Map Flying J Travel Center #746 2025 South 900 West Salt Lake City, Utah Project No. 23-14-112 Figure Prepared by: AGH Reviewed by: ACM Date: 5/1/25 2 0 SCALE: 1 inch = 80 feet 80 160 LEGEND Property Boundary (approximate) Monitoring Well Location MW-7 MW-1 Decommissioned Well Location TABLES Well ID Casing Diameter Surface Cover MW-7 2"Asphalt MW-8 2"Asphalt MW-9 2"Asphalt MW-10 2"Asphalt MW-11 2"Asphalt MW-12 2"Asphalt1015 Table 1 Screen Length ft. 10 10 10 Well Decommissioning Total Depth ft. 15 15 15 15 10 Well Specifications Flying J Travel Center #746 Salt Lake City, UT 1015 APPENDICES Appendix A Field Data Sheets