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f, U <br /> ;TANK CLOSURE REPORT ;V <br /> , 12320 EL Dorado,� Stockton, CA Aegis Project-No. 89-049 <br /> !.Rage 9 <br /> II <br /> As shown, in Table 2 referencing the underground product storage <br /> ,tanks, petroleum hydrocarbons were detected in three of the soil <br /> i- :samples. The samples containing detectable levels of petroleum <br /> hyd ocarbonslZere taken from 14 and 16 feet below grade at the ends of <br /> Itthe tank pits The 'rOTP" series of samples were taken from four sides <br /> f ;of the old tank pit at approximately 15 feet below grade. The "NTP" <br /> ,,series of samples were taken from the walls of the proposed new tank <br /> Vocation at 6 and 16 feet below grade. All samples are representative <br /> i <br /> �lof native soil. <br />` '3 2 1 'Petrol�um Hydrocarbons in Excavated Soil <br />, 11 �. <br /> ;Composite samples were submitted to a state-certified laboratory for <br />` analysis of TPH as gasoline with BTEX distinction, Ethylene Dibromide, <br /> sand total lead. The results of the analyses are summarized in Table <br /> 3 . Total ; lead results for all composite samples were below 10. 0 ppm. <br /> i 'The certified laboratory reports are contained in Appendix A. <br /> I ; <br /> ; .Laboratory analysis of composite soil samples from the stock piles <br /> ?' indicates that the soil can be hauled to a Class III land fill for <br /> !jdisposal (Appendix A) . The material is currently to be permitted to <br /> ,West Contra Costa County Landfill. The material will be removed by a <br /> licensed hauler after approval is received from the landfill and <br /> iSJCHD: <br /> 13 2.2 "-Soil Samples Associated With Product Line Trenches <br /> 11son samples referencing the product line trenches were submitted to a <br /> +=, state=certified laboratory for analysis of low/medium boiling point <br /> 1 hydrocarbonsI (TPH as gasoline) with BTEX distinction by EPA method <br /> ' 8015/8020, lead., and halogenated volatile organics by EPA method 8010. <br /> ; Detectable levels of TPH were found in three soil samples obtained <br /> beneath the product dispensing island nearest the station building. <br /> ' ; Soil sample laboratory analysis results are summarized in Table 3 . <br /> , Soil sample analytical results from the product piping trenches <br />{ + indicate that remedial action will be required for soil from those <br /> j areas Aegis'� is recommending over-excavation to confirmed limits of <br /> , detectable petroleum hydrocarbons in targeted soils. <br /> tip <br /> & � <br /> y <br /> V,VIRONMENTAL HEAi`r <br /> r /SER\/iCE <br /> I CI.IY <br /> A _ <br /> I! <br /> d <br />