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UST Closure Report Sharpe Defense Distribution Region West Lathrop,California Page 6 3.1.2 Equipment Equipment utilized at the site included the following: • Water tank truck and hot water pressure washer for rinsing the USTs and product piping; • 325 Caterpillar excavator for unearthing and excavating around the USTs; • 60-ton crane to lift the USTs from the excavation; • Hitachi EX200 excavator with a breaker attachment to break up concrete dispenser islands and drive pads; • John Deere 310 backhoe with a clamshell bucket to load product piping into bins; • Volvo L90 loader, a John Deere 550 80 HP bulldozer and two, 10-wheel end-dump trucks to relocate stockpiled excavation materials; • a Volvo L120C front-end loader with a 4-in-1 bucket, a Caterpillar D5M bulldozer, and several 10-wheel, rear-dump transport trucks for moving, placing and spreading backfill; • a Bomag 13W 213PDB-2 soil compactor with a vibratory, 84-inch wide, single, `sheep's foot' roller, for compacting backfill; • a John Deere, 50 HP, multibox, landscaper tracker for scraping, and a bob cat sweeper for sweeping pavement surface surrounding the excavation site; and • Various non-sparking hand tools. 3.2 UST Removal UST removal activities were conducted at the site between December 10, 1998 and February 5, 1999 under the supervision of Hugh Ashley and Steve Essert of CAL INC. 3.2.1 Site Preparation Underground utility lines were located and marked on the surface by Subtronic Corporation on September 8, 1998. On December 10, all diesel fuel and unleaded gasoline was pumped, under the direction of the US Army Corps of Engineers, from the USTs and transferred to the new above ground storage tanks installed by CAL INC on the depot near 1"Avenue. A facility status report on the tank contents for December 10 indicated the 8 USTs contained a total of 4112 gallons of diesel fuel and 7790 gallons of unleaded gasoline prior to being pumped. On December 14, 408 feet of 6-foot high, wire chain link security fencing was installed on the perimeter of the site to provide security and safety. 3.2.2 UST and Piping Rinsing ® All product and vapor return piping between dispensers and USTs were triple rinsed with hot water. The rinsate was backflushed and drained into USTs. Delta Oilfield Services vacuumed 1,500 gallons of sludge from the USTs on December 17, 1998 for transport and disposal. All USTs were triple rinsed with a 3000 psi, hot water pressure washer on December 18. Water was N:\PROJECTS\3546\Reports\3546 UST Closure Report Draft.doc March 24,1999