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Records Center UST Closure In-Place and Soil Sampling Report April 20,2012 Page-3- respectively, at a depth of approxin ately ten feet bgs, or approximately three and half feet below the UST. The samples were collected f om the native soil beneath the UST. The soil sample locations are shown on Figure 4 in Appendix A. The soil samples collected from beneath the UST were obtained by manually driving a clean stainless- steel or brass tube into soil using a slide-hammer, extensions and a drive shoe that holds the tube. The soil samples were immediately seal d with Teflon sheeting, capped, labeled, and placed in a cooler chilled with ice. All soil samples were hand delivered following chain-of-custody procedures to Argon Laboratories in Ceres, California for analyses. 5.0 TANK ABANDONMENT Approval to abandon the UST in-place by filling it with a cement mixture was given by the FPD on the permit inspection ticket and the SJCEHD in a letter dated March 29, 2012 (Appendix B). A truck loaded with cement was brought into position, and a funnel was attached to the chute. The funnel was positioned in to the fill opening in to the UST. Approximately two cubic yards of cement was discharged into the UST while a hammer was used to strike the UST and dislodge air bubbles. Approximately three cubic feet of cement overflowed into the excavation. The vent piping was filled with cement after the vent pipe was removed and the excavation had been backfilled. The Under Ground Storage Tank Disposition Tracking Record, Hazardous Was Tank Closure Certification, and revised Backfill Excavation Certificate are included in Appendix B. 6.0 BACKFILL AND COMPACTION With the concurrence of Jeffery W ng of the SJCEHD, the excavated soil from the excavation was placed back into the excavation as ba kfill material after the completion of UST activities. Excavated soil was placed into the excavation in fou to six-inch lifts and compacted using a combination of the backhoe bucket and gas powered vibratory plate. Compaction was verified with a small diameter probe rod and observations that the material had enough moisture that it bound together when squeezed by hand. The compacted soil filled the excavation io approximately eight inches bgs. Imported 3/4-inch aggregate base rock was placed and compacted in two lifts to backfill the excavation to the surface. On Thursday, April 5, 2012 Condor and Jim Thorpe Oil returned to the Site to replace the top four inches of the aggregate base with asphalt to restore the surface to the original grade and surface. 7.0 SOIL DISPOSAL One barrel of soil generated during the May 5, 2011 investigation was removed from the site and transported by Ramos Environmental Services in West Sacramento, CA on April 12, 2012. Ramos Environmental Services transported the soil to Pacific Resource Recovery in Los Angeles CA for final---- disposal at an appropriate landfill. The Uniform Hazardous Waste Manifest is included in Appendix B. 8.0 LABORATORY ANALYSE As directed by Jeffery Wong, the so l samples collected from beneath the former UST were sent to the laboratory to be analyzed for TPH-G and TPH-D by EPA Method 8015M, and for BTEX, Methyl Tertiary Butyl Ether(MTBE), Tertiary Butyl Alcohol (TBA),Di-Isopropyl Ether(DIPE),Ethyl tert-butyl ether (ETBE), tertiary-amyl methyl lether (TAME), 1,2-dichloroethane (1,2-DCA), and Ethylene Di- Bromide (EDB) and chlorinated hydrocarbons by EPA Method 8260B; LUFT 5 metals (cadmium, chromium III, lead, zinc, and nickel) by EPA Method 6010A; Chromium VI by EPA Method 7199; and polychlorinated biphenyls (PCB) by EPA Method 8080. The laboratory substituted EPA Method 8082A, as i/it CONDC