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UST Closure Report 9 Sharpe Defense Distribution Region West Lathrop,California Page 2 • Sampling and analytical program; • Results of chemical analyses; • Materials handling and disposal; • Site restoration; and • Conclusions and recommendations. All figures are included in Appendix 1. Photographs of the UST removal project are presented in Appendix 2. A copy of all Certificates of Analyses is included in Appendix 3; all Chain of Custody documentation is in Appendix 4. The UST Waste Manifests are contained in Appendix 5 (the Certificate of Disposal will be forwarded as soon as it becomes available from ECI). The tank and piping sludge and rinsate Uniform Hazardous Waste Manifests are contained in Appendix 6. The permits obtained prior to commencing the project are included in Appendix 7. The Official Inspection Report of the UST removal and soil sampling by the San Joaquin Environmental Health Division is contained in Appendix 8. Finally, copies of the results of the geotechnical tests conducted on the fill materials are included in Appendix 9. 2.0 SITE DESCRIPTION AND BACKGROUND The Department of Defense Logistics Agency, Defense Distribution Depot San Joaquin, Sharpe site is located in Lathrop, California (Figure 1). Lathrop is 50 miles south of Sacramento. The depot comprises warehouses and administration offices for managing and distributing procurement materials and equipment. The UST site is located in a relatively open area near the west-center of the Depot. The site is on the northeast comer of the intersection between F Street and 3rd Avenue and just southeast of the very large warehouse No. 330. The conditions of the site prior to removal of the USTs and fuel dispensers are shown in a series of photographs in Appendix 2. They show that the USTs were buried beneath a semi-elliptical, gravel-covered area measuring about 65 by 155 feet (Figure 3). The gravel area is surrounded by asphalt paving, except on the west and sides, where 30 by 85 feet and 15 by 85 feet concrete drive pads flanked it. A 6.5 by 83-foot, concrete island with overhead diesel fuel and gasoline dispensers was centered on the western drive pad. There was also a conventional diesel fuel dispenser at the north end of the island. Adjoining the truck fill drive pads to the west was a smaller (12 by 27 feet) concrete drive pad. In the center of the drive pad was a 5 by 12 foot- concrete island with two dispensers for unleaded gasoline. Near the center of the gravel area there was a steel-framed canopy (with potentially asbestos- bearing concrete tile siding and roofing (Transite ®) on a concrete pad. Plan drawings suggest it covered fuel separators which were connected to a 550-gallon UST for wastewater collection 13 feet to the west. The 550-gallon tank apparently was also use to collect any overflow spillage resulting during filling operations (UST #64,Figure 3). N:\PROJECTS\3546\Reports\3546 UST Closure Report Draft.doc March 24,1999