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CLOSURE REPORT FOR UNDERGROUND STORAGE TANK 871-DlUl <br /> Name and address of disposal facility: Erickson Inc. (Hauler No. 0019), <br /> 255 Parr Blvd.Richmond,CA 94801 (510)235-1393. <br /> [X] Uniform Hazardous Waste Manifest"TSD Facility to Generator"and LLNL Hazardous <br /> Waste Disposal Requisition copies for UST 871-DlU1 are enclosed as Appendix C. <br /> [N/A] UST Disposition Tracking Record enclosed (San Joaquin County Only). <br /> STC Tank#39-1945-17. <br /> EXCAVATION INFORMATION: <br /> Soil was excavated by: Aronson Engineering. Date: 7 26 94 <br /> Shoring was required: [ ] Yes [X] No <br /> Type of shoring used: N A. <br /> Soil types encountered within the tank excavation: <br /> 0-3 in. Asphalt. <br /> 3 in.-1 ft. Soil and gravel base. <br /> 1-20 ft. Grey siltstone and grey sandy soil. <br /> Describe any potential contaminant pathways such as tree roots or underground utility lines <br /> discovered in the excavation: Fractures in the siltstone were noted. <br /> Describe any odors or staining found in the fill material or native soil: 1.) At the beginning of <br /> excavation around the tank,four 55 gallon drums were filled with diesel fuel contaminated <br /> pea gravel removed from around the fill pipe The drums were given to LLNL Hazardous <br /> Waste Management for disposal. 2.) The native siltstone below the tank and fill gravel <br /> contained diesel fuel believed to have been released from a tank that was replaced in 1982 <br /> by the just removed tank. <br /> Soil Disposal Information: <br /> [ ] Not Applicable. (Soil and backfill placed back into the tank excavation and piping trench). <br /> The volume of disposed soil: 85 cubic yards. <br /> The soil was transported by: Aronson Engineering created piles pending completion <br /> of analyses of soil samples and review of results. <br /> The soil was disposed of as: N/A Date: N/A <br /> The concrete tank anchoring structure(s)was disposed of with the soil: <br /> [NA]Yes [ ] No [ ] Left in the Tank Excavation [ ]N/A <br /> If no,describe how the concrete tank anchoring structure(s)was disposed of: N/A <br /> Name and address of disposal facility: Not yet determined. Results of analyses of soil samples <br /> are being reviewed <br /> Additional native soil removed as part of a remedial effort: [ X ]Yes [ ]No <br /> Diesel fuel contaminated soil(siltstone)was excavated to a depth of 20 feet. <br /> [ ] LLNL Hazardous Waste Requisition and Uniform Hazardous Waste Manifest"TSD <br /> Facility to Generator"copy for the soil enclosed. Will be submitted when available. <br /> Volume of native soil removed: 55 cubic yards. <br /> Volume of backfill removed: 30 cubic yards. <br /> Describe how the excavated soil was handled (i.e. how and where it was stored): The soil was <br /> stock fled on visqueen covered with visqueen and stored. The soil will be retained at this <br /> site until soil analyses and review procedures are complete Shipping documents and/or <br /> hazardous waste manifests will be forwarded to the County when soil disposal is complete. <br /> Soil or backfill returned to the tank excavation or piping trench: [ ]Yes [X]No <br /> If yes,volume of soil returned to the excavation: N/A cubic yards <br /> Reason for the return of the soil to the tank excavation or piping trench: N/A. <br /> 2 <br />