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UST Closure Report Sharpe Defense Distribution Region West Lathrop,California Page 5 Underground Storage Tanks Storing Hazardous Materials' was obtained from the Environmental Health Division on December 9, 1998 (see Appendix 7). The Division requires the submission of an Underground Storage Tank Closure Report after the UST removal has been completed. The Mr. Steve Sasson, inspector for the Division provided soil sampling direction, guidance and oversight during the UST removal project. 2.3.2 Defense Depot Sharpe Fire Department The Defense Depot Tracy Fire Department (DDJC Tracy Fire Department) was notified 48 hours prior to the UST removal. 3.0 FIELD ACTIVITIES 3.1 Introduction This section presents a description of the field activities conducted at the Sharpe site during the UST removals between December 10 and March 12, 1999. Field activities consisted of the following main tasks: • Installation of two, new, 12,000-gallon above-ground storage tanks 0.6 mile to the north of the UST site; • Transferring contents of the unleaded gasoline and diesel fuel USTs to the new above-ground storage tanks; • Installation of a temporary fence around the site for security and safety; • Back-flushing all product lines to the USTs; • Removing all above-ground equipment and piping, including fuel dispensers; • Demolishing, removing and disposing of the concrete fuel dispenser islands and drive aprons, and asphalt paving as required to access buried piping; • Triple rinsing the eight USTs with hot water; • Pumping sludge and rinsate into vacuum tank trucks and disposing of sludge and rinsate; • Excavating fill materials from tops and sides of the USTs and piping and stockpiling; • Dismantling all product and vapor return lines, and loading into a metal bin for disposal; • Inerting,removing, transporting and disposing of the USTs; • Collecting and analyzing soil and groundwater samples from the UST excavation floor and soil samples from stockpiles of excavated material for profiling; • Backfilling the UST excavation and all pipe trenches with stockpiled excavated material and clean imported fill materials, compacting and grading. 3.1.1 Personnel ® Personnel on site included Hugh Ashley, Steve Essert and Gary Benvenuto, Site Superintendents/Site Safety and Health Officers, and John Hruska and Edward Hugel, assistant project managers for CAL INC. Mr. Doug Betz was the project inspector for the US Army Corps of Engineers. Mr. Maurice Benson is the Environmental Engineer at DDRW Sharpe. NAPR0JECTS\3546\Reportsl3546 UST Closure Report Draft.doc March 24,1999