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Analysis of composite soil samples STP-1 and STP-2 collected from the diesel tank overburden <br /> Y P P ( <br /> stockpile)revealed no detectable concentrations of benzene, toluene,ethyl benzene, and <br /> xylenes, but revealed detectable diesel fuel concentrations of 48 ppm and 23 ppm,respectively. <br /> Analysis of the piping soil samples ( PBST-Pl,PBST-P2,PBST-P3,PBST-P4 and PBST-P5), <br /> collected from under the concrete vault containing the former tanks piping,revealed no <br /> detectable petroleum hydrocarbons. All soil sample analytical results are listed in Table 1 with <br /> laboratory reports included in Appendix E. <br /> 2.4 New Tank Installation <br /> The new 1,000 gallon diesel tank was installed on August 13, 1997, as scheduled. <br /> 2.5 Soil Disposal <br /> During UST removal activities,one overburden soil stockpile (approximately 200y&of soil) <br /> was generated. Upon analysis,minor detectable diesel fuel concentrations were encountered in <br /> both of the composite soil samples collected from the soil stockpile. Offsite disposal of the soils <br /> was conducted. The stockpiled soils were transported by representatives of Caballero Trucking <br /> to the Forward Incorporated landfill in Stockton for disposal. Copies of the transport documents <br /> for the eight loads of soil are included as Appendix F. <br /> 3.0 Conclusions <br /> 3.1 Observations <br /> The 3,500 gallon diesel UST was found to be intact upon removal. No petroleum staining or <br /> odors were noted in the UST excavation. No detectable petroleum hydrocarbons were <br /> encountered in the verification samples from the diesel tank or from the soil samples collected <br /> under the concrete piping vault. The tank overburden stockpiled soils were found to contain <br /> minor detectable diesel fuel concentrations, and were subsequently disposed offsite. <br /> In conclusion, based on review of the soil sample analytical results it appears that no further <br /> actions in the vicinity of the former UST are warranted. <br /> cAsydney\pbstock.ust 4 <br />