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CLOSURE REPORT FOR UNDERGROUND STORAGE TANK 827-DlU1 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 Additional native soil removed as part of a remedial effort: [X]Yes [ ]No Soil was removed due to approximately 10-gallons having spilled from the tank during excavation Additional soil was removed due to the detection of an apparent odor,unrelated to the spillage Ap=proximately 20 cubic yards total were removed after the tank was excavated [N/A] LLNL Hazardous Waste Requisition and Uniform Hazardous Waste Manifest"TSD Facility to Generator"copy for the soil enclosed. Volume of native soil removed: see next)* cubic yards. Volume of backfill removed: 120*cubic yards. [*Combination of native and backfill material] Describe how the excavated soil was handled (i.e. how and where it was stored): The soil was stockpiled on and covered with visc'ueen The stockpiles are located by the gate north of B827A and south of B827A behind the 827-DlU1 excavation at Site 300. 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 ENVIRONMENTAL SAMPLE INFORMATION: SOIL Soil sample collection and handling procedures were in accordance with LLNL Tank Assessments and Guidance Group Procedure 203,Soil Sampling. Soil samples were collected by: Marion Heaton,LLNL Date: 3/11/94 Sample analyses requested: Tank Excavation (TPH Diesel and BTXE)• Stockpile (TPH Diesel; BTXE• EPA Method 8010/8020 Metals by STLC/TTLC• and Reactivity Corrosivity, and Ignitability (RCI))• and Buildings 827 836 and 879 tank removal stockpiles composited for gross alpha & beta tritium and gamma spectrometry. Samples collected for disposal options included 1 discrete sample collected for each 25 yards TPH-D•Total Petroleum Hydrocarbons as Diesels BTXE• Benzene Toluene Xylenes and Ethyl Benzene; HVOC EPA Method 8010 for Halo=ated Volatile Organic Carbons• AVOC• EPA Method 8020 for Aromatic Volatile Organic Carbons, STLC• Soluble Threshold Limit Concentration; TTLC•Total Threshold Limit Concentration Name and address of analytical laboratory: California Laboratory Services, 3249 Fitzgerald Road Rancho Cordova CA 95742 [Radiological analyses on stockpile composite samples were performed by LLNL Environmental-Analytical Sciences Lab]. Describe how the tank excavation was secured after soil sample collection: The excavation was secured by means of yellow plastic "snow fence" and barricades equipped with flashing lights The excavation was then filled with imported clean fill. WATER [X] Not applicable. (No water in the tank excavation or piping trench) Static water level below grade: N A feet Describe any sheen,free product or odor present in the water: None present. Water pumped out of the excavation:[ ] Yes [X]No Volume of water removed from the tank excavation: N/A gallons Water sampled: [ ]Yes [X]No Water sample was collected by: N/A Date:N/A Sample analyses requested: N/A Name and address of analytical laboratory: N/A Describe how the water was sampled: N/A Identify the source of the water(if known): N/A Describe where and how the removed water was stored on site,and type of containment used: N/A 3 i