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CLOSURE REPORT FOR UNDERGROUND STORAGE TANK 827-D2U1 CLOSURE REPORT CONCLUSIONS: UST 827-122U1 was closed according to the Closure Plan approved by the San Joaquin County Public Health Services. • On June 22,1994,the tank system was closed and the the tank was removed from the ground. Soil samples collected from within the excavation and from the soil removed from the excavation were submitted for analyses of TPH-D (diesel fuel) and BTXE (benzene, toluene, xylenes, and ethylbenzene). On July 1, the results of analyses were received and indicated 11.0 mg/kg of diesel fuel (by TPH-D method) in the soil sample collected from the excavated soil and fill gravel, and no BTXE compounds. Another soil sample collected from a depth of 10 feet within the excavation (TK02-827-01-D2U1-SO-10.0) indicated no TPH-D or BTXE compounds. • The stockpile soil from the UST 827-D2U1 excavation has not been remediated, nor has a method of proper disposal been determined. • 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: • 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 July 11, 1994 (see Appendix F)based on the resulting analyses of soil samples collected on June 22,1-994. • Tank testing had shown this tank to be leak tight. • Weather was sunny and windy. • Soil compaction was performed as indicated on the Consolidated Engineering Labs Field Density Report see Appendix G). • The certificate of tank destruction is enclosed as Appendix H. 5