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• <br /> 1� 1h3adwellMollo <br /> 1 Tables 1 and 2 show the analytical results for the soil and groundwater confirmation samples, <br /> 1 respectively. Appendix B presents the analytical laboratory reports. <br /> 1 4.5 Soil Stockpile Sampling and Disposal <br /> Soil from the excavation was placed in four stockpiles according to excavation depth(0 to 5, 5 to <br /> ' 20, 10 to 15, and 15 to 22-foot depths) and covered with visqueen. As requested by Jeff Wong <br /> of the SJCEHD, four discrete soil samples were collected on 4 and 5 May 2004 from each of the <br /> 1 soil stockpiles, for a total of 16 samples. Two discrete samples were analyzed from each of the <br /> 0 to 5-foot, 5 to 10-foot and 10-15-foot deep stockpiles. For the 15-22-foot deep stockpile, all <br /> 1 four discrete samples were composited and analyzed . All samples from the soil stockpiles were <br /> analyzed for TPHg, BTEX, and total lead. Table 3 presents the analytical results for the <br /> 1 stockpile samples. Appendix B presents the analytical laboratory reports. <br /> MOn the basis of the analytical results, 1,180 tons of stockpiled soil were disposed as non- <br /> hazardous Class II material at Forward Landfill in Stockton, California. Appendix C includes <br /> ' copies of the landfill waste manifests. The two discrete soil samples collected from the 0 to <br /> 5-foot stockpile did not contain TPHg or BTEX above laboratory reporting limits except for <br /> 1 xylenes detected at 0.031 mg/kg. Lead was ectedat7 9 and 20 mg/kg in these samples <br /> (Table 3). Jeff Wong of the SJCEHD approved of leaving the 0 to 5-foot soil stockpile at the <br /> ' Site for reuse as backfill. <br /> 1 4.6 Soil Import and Backfill <br /> On 11 May 2004, clean fill material was imported from other areas on the Site and used to <br /> backfill the excavation. Prior to backfilling, 500 pounds of ORCO was mixed with water and <br /> ' added to the excavation using the bucket from the excavator. All backfilling and compaction <br /> activities were observed by Kleinfelder&Associates, the geotechnical engineering firm for the <br /> ' project. <br /> ' 25971021.DJS 7 18 November 2004 <br />