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CLOSURE REPORT FOR UNDERGROUND STORAGE TANK 836-DlUl feet of supply and 13-feet of return line, and 7-feet of vent Piping. Thisip ping was removed on 6/22/94 and manifested with UST 827-D2U1 and associated piping 7/22/94) The UST 827-D2U1 Closure Report will be submitted to your office at a later date Type/diameter of aboveground piping: 2-inch diameter vent piping. Type/diameter of underground piping: 1-inch diameter supply and return piping; and 2-inch diameter vent piping. Any piping closed in place: [X]Yes [ ]No Approximately 27-feet of supply and 27-feet of return line located under the concrete was closed in-place Also approximately 22-feet of vent pining was left in-place Describe where the piping was closed in place,and how it was closed(e.g.grouted and capped): On March 18 1994 PetroTek performed a pressure test on the12iTing which resulted in the indication of at least 2 leaks (see OTHER OBSERVATIONS). Supply,return,and vent lines were then grouted and capped from the asphalt/concrete interface to the emergency generator. Underground concrete tank anchoring structure(s)were present: [ ]Yes [X]No Size and location of the concrete tank anchoring structure(s): N/A Description of tank and piping condition (corrosion, pitting, holes, etc.): The tank had some corrosion,but appeared to be intact. Photographs of the tank were taken by Marion Heaton (3/11/94). The tank was in decent condition,and there was no staining in the excavation after the tank was removed. The tank and piping*were transported by: Erickson Inc. (*except pipe noted as having been removed and manifested with later tank closures) The tank and piping* were disposed of as: Non-RCRA Hazardous Waste. Solid (Empty Containers Last Containing Diesel Fuel with associated pining). Date: 3/11/94 (*except pipe noted as having been removed and manifested with later tank closures) Name and address of disposal facility: Erickson Inc. (Hauler Registration No. 0019), 255 Parr Blvd.Richmond,CA 94801 (510)235-1393. [X] LLNL Hazardous Waste Disposal Requisition and Uniform Hazardous Waste Manifest "TSD Facility to Generator" copies for the tank and piping shipped 3/11/94 and for the piping shipped on 6/22/94 and 7/26/94.are enclosed as Appendix C. [N/A] UST Disposition Tracking Record enclosed (San Joaquin County Only). SIC Tank#39-1945-27. EXCAVATION INFORMATION: Soil was excavated by: PetroTek. Date: 3/11/94 Shoring was required: [ ] Yes [X] No Type of shoring used: N/A. Soil types encountered within the tank excavation: 0-11 ft. Brown Silty Gravel Describe any potential contaminant pathways such as tree roots or underground utility lines discovered in the excavation: Sanitary sewer line was located next to the tank excavation. Describe any odors or staining found in the fill material or native soil: None. However,a"sliVht odor" was indicated on sample#TK01-01-836-D1U1-SP-SO that had been collected from the excavated soil stockpile. Soil Disposal Information: [ ] Not Applicable. (Soil and backfill placed back into the tank excavation and piping trench). The volume of disposed soil: N/A cubic yards. The soil was transported by: N/A The soil was disposed of as: N/A Date: N/A The concrete tank anchoring structure(s)was disposed of with the soil: [ ]Yes [ ]No [ ]Left in the Tank Excavation [X]N/A If no,describe how the concrete tank anchoring structure(s)was disposed of: N/A Name and address of disposal facility: N/A 2