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Analysis of the composite soil stockpiles samples (SP-1 and SP-2) collected from the tank <br /> overburden stockpile revealed no detectable petroleum hydrocarbon concentrations; however, <br /> a detectable total lead concentration of 4.0 ppm was encountered in the SP-1-D duplicate <br /> stockpile sample. No detectable lead concentrations were encountered in the SP-2-D <br /> duplicate sample upon analysis. The duplicate stockpile soil samples were found to be non <br /> reactive, non corrosive and not ignitable. All soil sample analytical results are listed in <br /> Table 1 with laboratory reports included in Appendix E. <br /> 2.4 Excavation Backfill/Extraction Well Installation <br /> After soil sample analyses were complete, the analytical data was submitted to San Joaquin <br /> County Inspector Jerry Yoshioka for approval to backfill the excavation. Approval was <br /> received on March 16, 1995 with the new tank installed into the excavation concurrent to <br /> backfill operations. Pea gravel and base rock were then introduced to the hole in the <br /> quantities necessary to return the level to grade. As pea gravel achieves 90% compaction by <br /> nature, no mechanical compaction was required at the site. Resurfacing was then completed <br /> at the site by representatives of Aronson Engineering Incorporated. <br /> 2.6 Soil Disposal <br /> During tank removal efforts, an overburden soil stockpile was generated. The pile consisted <br /> of approximately 200 yd' of tank overburden fill material, generated March 13, 14, and 15, <br /> 1995. Based on analytical results, the stockpiled soils were transported by Caballero <br /> Trucking to the Browning Ferris Incorporated Sanitary Landfill in Livermore, California. <br /> Copies of the non-hazardous special waste manifests and weighmaster certificates for the <br /> loads of soil are included as Appendix F. <br /> 3.0 Conclusions <br /> 3.1 Observations <br /> The 10,000-gallon UST and associated piping were found to be intact upon removal. <br /> Analytical results from soil samples collected from the tank excavation side walls and beneath <br /> the dispenser island indicated no detectable concentrations of petroleum hydrocarbons. <br /> Analysis of the two original composite soil stockpile samples revealed no detectable <br /> petroleum hydrocarbon concentrations; however, a detectable total lead concentration, <br /> equivalent to expected background lead levels, was encountered in one of the duplicate <br /> stockpile samples. <br /> MZ/04-I 1-95/UST/95-0102.NBR 4 <br />