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CLOSURE REPORT FOR UNDERGROUND STORAGE TANK 827-DlU1 CLOSURE REPORT CONCLUSIONS: • UST 827-DlUl was closed according to the Closure Plan approved by the San Joaquin County Public Health Services • In August of 1993 the fuel lines(supply&return)were capped at the boiler by Site 300 Plant Engineering. The fuel supply,fuel return.and low-pressure steam piping were enclosed within a 12-inch diameter corrugated metal pi_l2 (CMP) The low-pressure steam line piping connected the boiler to the fuel oil heater. The low-pressure steam line piping was covered with asbestos and was removed by a State of California registered asbestos abatement contractor, J D General and shipped to "General Industrial" (8/26/93• Manifest #92259058• Hazardous Waste Disposal Requisitions#H127243&#H127237). • The low-pressure steam pining had been removed b sliding aiding it out of the CMP (8/26/93),. leaving the CMP in-121ace • The fuel lines contained within the CMP were later removed by ABM Mechanical along with the boiler and its inside pumps and day tanks(9/29/93) These sections of pipe were taken off- site by ABM Mechanical(no requisition or manifest). The CMP was left in-place. • On March 11 1994 the remaining product(portion not contained within the CMP) and vent line piling was removed by PetroTek and transported by Erickson to the Erickson facility. As the tank was lifted from the excavation ten gallons of diesel fuel sludge poured through a corrosion hole in the bottom of the tank resulting in the removal of the free liquid remaining in the tank Impacted soil was excavated placed on plastic and sampled for TPH-D analysis The results of the TPH-D analyses for samples collected from the excavated soil (east and west stock piles) and one of the two soil samples collected from within the excavation(at a depth of 194 inches below the surface and near the area of spilled sludge) indicated the presence of diesel fuel OnWy one sample collected from the west soil stockpile(TK05-01-827-D1U1-SP-SO) indicated the presence of Toluene (0.73 mg/kEthvlbenzene (0.54 mg/kg) and Xylenes (3.2 mg/kg):Benzene was not detected in the sample BTEX constituents were not detected in any of the other samples collected • The stockpile has not been remediated and is currently awaiting proper disposal or reuse • On 6/22/94 Inspector William Snavely visually inspected the inside of the CMP and stated that soil samples from beneath the CMP culvert were not required in order to receive "Closure." The approximately 20-foot long section of CMP remains closed in place. • At this time LLNL does not plan any further action for this tank closure [X] Photographs of tank closure activities are enclosed as Appendix D. [N/A] A copy of the State Water Resources Control Board UST Permit Application Form B shall be submitted to your office within 30 days of the submittal of this report. [N/A] A copy of the State Water Resources Control Board UST Permit Application Form B was submitted to your office with the UST Closure Plan. OTHER OBSERVATIONS: • When the tank was lifted from the closure excavation (3/11/94) it released ten gallons of sludge through a corrosion hole. The remaining free liquid within the tank was then removed, and the corrosion hole was reamed and plugged prior to tank shipment. The potentially impacted soil was excavated and sampled Tank testing had shown this tank to be leak tight. • As required an Underground Storage Tank Unauthorized Release (Leak)/Contamination Report was sent to Mr. Doug Wilson of the Public Health Services of San Joaquin County on March 18 1994(see Appendix F) • Weather was sunny and windy. • Soil compaction was performed as indicated on the Consolidated Engineering Labs Field Density Report see Avvendix G). • The certificate of tank destruction is enclosed as Appendix H. 6 6