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CLOSURE REPORT FOR UNDERGROUND STORAGE TANK 834-DIUI Description of tank and piping condition (corrosion, pitting, holes, etc.): The tank and piping were in good condition The tank was bare carbon steel not tar coated Photographs o the tank were taken by Rich Shonfeld (7/27/941• The tank and piping were transported by: Erickson,Inc. The tank and piping were disposed of as: _Non-RCRA Hazardous Waste, Solid (Empty Containers Last Containing Diesel Fuel with associated piDate: 7/27/24 Name and address of disposal facility: Erickson Inc. ,(Hauler Registration No. 0019), 255 Parr Blvd Richmond CA 94801 (510)235-1393. [X ] Uniform Hazardous Waste Manifest"TSD Facility to Generator" and LLNL Hazardous Waste Disposal Requisition copies for UST 834-DlUl are enclosed as Appendix C. [N/A] UST Disposition Tracking Record enclosed (San Joaquin County Only). 51C Tank#39-1945-12. EXCAVATION INFORMATION: Soil was excavated by: Stone and Webster. Date: 7/27/94 Shoring was required: [ ] Yes [X] No Type of shoring used: N A. Soil types encountered within the tank excavation: 0-2 in. Asphalt. 2 in. -4 ft. Soil. 4-9 ft. Clayey Soil. 9- 13 ft. Gravely Clayey Soil. Describe any potential contaminant pathways such as tree roots or underground utility lines discovered in the excavation: At a depth of 2 feet an electric ground wire was noted. Describe any odors or staining found in the fill material or native soil: Visual evidence and smell of diesel fuel in soil at a depth of 9 feet and below. Soil Disposal Information: [ ] Not Applicable. (Soil and backfill placed back into the tank excavation and piping trench). The volume of disposed soil: 60 cubic yards. The soil was transported by: Stone and Webster created a pile in the B834 area pending_completion of analyses of soil samples and review of results. The soil was disposed of as: N/A Date: N/A The concrete tank anchoring structure(s)was disposed of with the soil: [NA] Yes [ ] No [ ] Left in the Tank Excavation [ ] N/A If no,describe how the concrete tank anchoring structure(s)was disposed of: N/A Name and address of disposal facility: Not yet determined. Results of analyses of soil samples are being reviewed. Additional native soil removed as part of a remedial effort: [ X ] Yes [ ] No Diesel fuel contaminated soil was excavated to a depth of 13 feet Excavation was terminated at this depth to avoid contacting groundwater at 17 ft.8 in. [ ] LLNL Hazardous Waste Requisition and Uniform Hazardous Waste Manifest"TSD Facility to Generator"copy for the soil enclosed. Will be submitted when available. Volume of native soil removed: 15 cubic yards. Volume of backfill removed: 455 cubic yards. Describe how the excavated soil was handled (i.e. how and where it was stored): The soil was stockpiled on, and covered with visqueen, and stored in the B834 area, at Site 300. The soil will be retained at this site until soil analyses and review procedures are complete. Shipsping documents and/or hazardous waste manifests will be forwarded to the County when soil disposal is complete. Soil or backfill returned to the tank excavation or piping trench: [ ] Yes [X] No If yes,volume of soil returned to the excavation: N/A cubic yards Reason for the return of the soil to the tank excavation or piping trench: N/A. 2