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CLOSURE REPORT FOR UNDERGROUND STORAGE TANK 871-DiU1 Name and address of disposal facility: Erickson Inc (Hauler Registration No 0019) 255 Parr Blvd. Richmond CA 94801 510 23 -1393. [X ] Uniform Hazardous Waste Manifest"TSD Facility to Generator" and LLNL Hazardous Waste Disposal Requisition copies for UST 871-D1U1 are enclosed as Appendix C. [N/A] UST Disposition Tracking Record enclosed (San Joaquin County Only). SIC Tank# 39-1945-17 EXCAVATION INFORMATION: Soil was excavated by: Aronson Engineering Date: 7/26/94 Shoring was required: [ ] Yes [ X] No Type of shoring used: N A. Soil types encountered within the tank excavation: 0-3 in. Asphalt. 3 in. - 1 ft. Soil and gravel base. I -20 ft. Grey siltstone and grey sandy soil Describe any potential contaminant pathways such as tree roots or underground utility lines discovered in the excavation: Fractures in the siltstone were noted. Describe anv odors or staining found in the fill material or native soil: 1.) At the beginning of excavation around the tank four 55 gallon drums were filled with diesel fuel contaminated pea gravel removed from around the fill pipe The drums were given to LLNL Hazardous Waste Management for disposal. 2 ) The native siltstone below the tank and fill gravel contained diesel fuel believed to have been released from a tank that was replaced in 1982 by the iust removed tank. Soil Disposal Information: [ ] Not Applicable. (Soil and backfill placed back into the tank excavation and piping trench). The volume of disposed soil: 85 cubic yards. The soil was transported by: Aronson Engineering created piles 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 vet 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(siltstone) was excavated to a depth of 20 feet [ ] 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: 55 cubic yards. Volume of backfill removed: 30 cubic yards. Describe how the excavated soil was handled (i.e. how and where it was stored): The soil was stockpiled on visqueen covered with visclueen and stored The soil will be retained at thi site until soil analyses and review procedures are complete Shipping documents and/or hazardous waste manifests will be forwarded to the Countywhen soil disposal is com Tete. 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