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Site Closure Report 5 Fortner Claude C.Wood Construction Yard,681 East Lockeford Street,Lodi,CA November 16, 1999 One sample, CCW-WOT-1, was collected from the tank pit floor at a depth of 6 feet below the tank invert and 12 feet below surface grade (Figure 3). An additional sample, CCW-WOT-2, was also collected from the stockpiled soil generated during the tank removal. Both samples were transported under chain of custody to American Environmental Network, Inc. for analyses Due to presence of stained soil in the waste oil tank pit floor, the SJCEHD filed an Underground Storage Tank Unauthorized Release (leak)/Contamination Site Report for the waste oil tank (Appendix B). The type of fuel released at the site was listed as diesel. 3.2 Waste Oil UST Removal Soil Sample Analyses The tank pit floor sample and stockpile sample were analyzed for the following constitents: benzene, toluene, ethylbenzene, xylenes (BTEX)via EPA Method 8020, total petroleum hydrocarbons-as-gasoline (TPHg), TPH-as-diesel (TPHd), and TPH-as-motor oil(TPHmo)using EPA Method 8015 modified, volatile aromatic hydrocarbon compounds using EPA method 8010, PCB's using EPA Method 8080,heavy metals cadmium (Cd),total chromium (Cr), lead (Pb),Nickel (Ni), and zinc(Zn) using EPA method 6010; and chromium VI (Cr VI)Using EPA method 7196. As shown in Table 1, contaminants identified in the sample collected from the tank pit floor were motor oil at 400 milligrams per kilogram (mg/kg), diesel at 3,300 mg/kg, gasoline at 150 mg/kg, and combined BTEX at 1.167 mg/kg. The heavy metals analyzed for were either not present above the laboratory reporting limit or present at background concentrations. No volatile aromatic hydrocarbons or PCB's were reported with concentrations above the laboratory reporting limit. A summary of the stockpile soil sample results are presented in Table 2. A copy of laboratory report is included in Appendix C. 3.3 Soil Over-Excavation and Sample Collection Due to the presence of petroleum hydrocarbons in the soil sample collected from the waste oil tank pit and the surface stains observed with the above ground tank farm, over-excavation of the soil was conducted in October 1994. During excavation, hydrocarbon stained soil were observed by ASTA from the surface and discontinuously extending to approximately 22 feet bgs. The contaminated soil was easily identified by staining and odor. As shown in Figure 4, the final excavation dimensions were 41 feet wide by 62 feet long, and extended to depths of 18 to 22 feet bgs. A total of 2,000 cubic yards of soil was generated and stockpiled during the excavation of AJ-ClosureRpt.RPT.wpd