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Home My WebLink AboutDERR-2024-005491 Tri Mart #92 Well Abandonment Report Page 1 Atlas 358 South 700 East, B518 Salt Lake City, Utah 84102 www.oneatlas.com Office: 801-935-4917 March 29, 2024 Mr. Hong Lei Tao Utah Department of Environmental Quality Division of Environmental Response and Remediation 195 North 1950 West Salt Lake City, Utah 84114-4840 SUBJECT: Monitoring Well Abandonment Report Former Tri Mart #92 329 North Main Street Clearfield, Utah Facility ID #3000384 UST Release Site HLH Work Assignment HLH-05 Dear Mr. Tao: In accordance with W ork Assignment 06 Atlas Technical Consultants (Atlas) abandoned two groundwater monitoring wells and one sub-slab vapor monitoring point (SSVMP) at the above referenced site. The abandonment efforts took place on March 7, 2024. A map showing the site layout and the decommissioned well locations is presented as Figure 1. Given that the wells were less than 30 feet deep, a state of Utah licensed well driller was not required to provide oversight. Atlas personnel performed all well abandonment activities. The abandonment activities of groundwater monitoring wells MW -21, MW -22, and SSVMP-1 are described in the following paragraphs. Decommissioning involved the proper abandonment of two 2-inch diameter groundwater monitoring wells and one SSVMP. Abandoning the monitoring wells included removing the well casings to a minimum of one foot below grade. The well casings were then backfilled to approximately one foot below grade using bentonite chips. The bentonite chips were then hydrated. The wells were then finished flush with the existing surface with concrete. All areas were then swept and cleaned. Atlas personnel properly disposed of all recovered well materials. The vapor pin decommissioning of the SSVMP included removing the vapor pin, then finishing the surface to match the surrounding concrete. Photographs taken during the abandonment activities are presented in Appendix A. Our services consist of professional opinions and recommendations made in accordance with generally accepted geotechnical and environmental engineering principles and practices. This warranty is in lieu of all other warranties either expressed or implied. Should you have any questions, please do not hesitate to contact us at (801) 935-4917. Tri Mart #92 Well Abandonment Report Page 2 Atlas Sincerely, Atlas Technical Consultants LLC Olaf Questereit Jim Coletta, P.G. Senior Technician Office Manager Utah Certified PST Consultant Enclosures N 358 South 700 East, B518 Salt Lake City, Utah 84102 (801) 935-4917 Site Map Tri-Mart #92 329 North Main Street Clearfield, Utah 84015 ATC Project Number: 271EM00853 SOURCE: Google Maps FIGURE 1 -Soil Boring Site Boundary Car Wash Canopy Dispenser Islands Former UST Basin Sewer Manhole Sewer Manhole -Hand Auger Soil Boring Sanitary Sewer -Sub-Slab Vapor Monitoring Point -Sanitary Sewer Line Approximate Scale: 1 inch = 60 feet MW-21 MW-22 -Existing Monitoring Well Super Stop Texaco SB-3 SB-4 SB-1 SB-2 SB-9 SB-8 SB-7 SB-6 SB-5 SB-10 SSVMP-1 64 West 300 North 336 North 75 West -Secondary Water Sample Location APPENDIX A PHOTOGRAPH LOG Well Abandonment Photographs Former Tri-Mart #92 329 North Main Street, Clearfield, UT Atlas Photo 1: View of monitoring well MW-21 being filled with bentonite chips. Photo 2: View of well MW-22 filled with bentonite. Photo 3: View of well MW-22 filled with hydrated bentonite chips with the top 6” of well casing broken off. Photo 4: View of monitoring well MW-21 after surface completion. Photo 5: View of monitoring well MW-22 after surface completion. Photo 6: View of sub-slab vapor monitoring point (SSVMP-1) after surface completion.