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+' FROM rC= Ground Zero Analysis PHONE NO. : 209 83B 9883 Jun. 23 1999 02:46PM P2 <br /> k <br /> GIRUU"ZERO ANALYSIS,INC. <br /> 1714 Mmh%Sftrca <br /> Escab mt Califemin 95320-1927 <br /> 1'elephaeua:��X38-9885 - <br /> Fsw�rl:ullc:(209)838883 . <br /> June 23, 1999 <br /> 1W Michael Infurna <br /> San Joaquin County Public Health Services <br /> EnvironmMal Health Division <br /> 304 Boat Weber Avenue, Third Floor <br /> Stockton,CA 95202 <br /> i <br /> Subject: Recommended Additional Excavation <br /> Woolsey Oil,Inc.-Cardlock Facility <br /> 1501 W. Charter,Stockton, California(Site Code: 508175) <br /> .Dear Mr.Infurna: <br /> Per our phone discussion yesterday we are writing to recommend additional source removal <br /> excavation at the subject property. <br /> Based on field observations and laboratory results it appears that the excavation on June 16 removed <br /> the majority of impacted soil beneath the former tankpit and tispensar islands_ The estimated 250 <br /> cubic yards of contaminated soil that was excavated and sto�ftiled is scheduled to be hauled to <br /> Forward Landfill today for disposal. <br /> Laboratory analysis of soil samples collected from the excav"a n walls following the removal of <br /> the contaminated material indicates that some diesel impacted soil still remains along.the northeast <br /> corner of the excavation. A table summarizing the lab.results along with a sketch map and cross <br /> section are attached. <br /> Inasmuch as the msidual contaminated soil in this area is'i!currently accessible we recommend <br /> additional excavation to remove this limited volume of material. We feel that the removal action <br /> will be beneficial in that it will tend to reduce long-term impact to groundwater. A cost estimate <br /> based on the removal of<150 cubic yards of contaminated soil has been prepared for submittal to <br /> the UST bund. <br /> 'I <br />