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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main,Street ? ? e + <br /> Escalon,California 95320-1927 <br /> nM <br /> Telephone: (209)838-9888 1 � `��1P,0E i €'i y ION <br /> Facsimile: (209)838-9883 '04 E.Weber Aye.Mird Floor <br /> P.O. Box M,Stockton,Cit 95201-0388 F <br /> phos e: (209)468-3420 <br /> June 23, 1999 °-n <br /> r4ph changes: See Remarks <br /> f3e` 'i@rlIk3 <br /> Mr. Michael Infurna <br /> i <br /> San Joaquin County Public Health Services <br /> Environmental Health Division ---- s°-- � <br /> 304 East Weber Avenue, Third Floor <br /> z By <br /> Stockton, CA 95202 <br /> plans gxtfa o;t1y to that <br /> 1. '. 1$ shown aro d '1r : : f��'�'r <br /> s"sQn b14 <br /> Subject: Recommended Additional Excavation �, : 4a1aurr1hC► z :` ir'ry fa; ° F��' �` � <br /> Woolsey Oil, Inc. -Cardlock Facility O ;" Vi C,4#Cie r,&.:4t; remr nt; 0l 61a1a t+.: s or <br /> r...:. <br /> 1501 W. Charter, Stockton, Californias te'Cfi <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 laboratoty results it appears that the excavation on June 16 removed f <br /> the majority of impacted soil beneath the former tankpit and dispenser islands. The estimated 250 <br /> cubic yards of contaminated soil that was excavated and stockpiled is scheduled to be hauled to ? <br /> Forward Landfill today for disposal. <br /> Laboratory analysis of soil samples collected from the excavation walls following the removal of <br /> the contaminated material indicates that some diesel impact4 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 residual contaminated soil in this area is '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 Fund. <br /> Woolseycharter\reports\addlexc.ltr <br /> I <br />