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Au <br /> - pRETANKRFPWCEMEN7SITE ASSESSMENT <br /> RESULTS REPORT <br /> t6g5 S.Et Dorado,Stockton,Caklo(nia <br /> Page a <br /> sat <br /> soi <br /> ! s <br /> 4 O DISCIIBBI9� <br /> nd field <br /> Based on the results <br /> the USTlbasin areanalticimgactedal iwith apetroleum <br /> screening, soils benact has not been <br /> .hydrocarbons. The horizontal he vertical extent°f TPH impact does <br /> determined. Preliminarily, roximately 40 feet below <br /> not appear to extend below a depth of app <br /> grade. <br /> I s <br /> ,..a Based on the results of the borings and <br /> field observations, <br /> sander at silts and <br /> i site geology is dominated by alluv:fallyeredphorizons, and therefore <br /> clays. These soils are thinly interlay <br /> present a complex soil profile with widely varied geologic and <br /> nt�ineering properties. These varied characteristics may be <br /> } responsible for the wide variance in the analytical data. <br /> 03 regardinAegis offers the followingaanksl <br /> usioni <br /> g and product lines at theasite:the of <br /> underground fuel stor <br /> a � <br /> 1} Native soils around the existing tank basin contain petroleum <br /> hydrocarbons as gasoline at detectable levels. Tho :precl de <br /> ' °which impacted soils:weof exca motered ion of would <br /> the generally preclude <br /> the 7jitigation opta <br /> 2) It is proposed to replace the existing tanks with now 12,000- <br /> . gallon tanks in a basin which w 300 cubicill iyarst ds ofrtia soil iwouldthin tbe <br /> i old basin. Approximately <br /> excavated during the tank closure to allow for tank removal. <br /> k '� Asi'additional 350 c bic.yards of soil will be excavated from <br /> t t , e tanks. <br /> the"extended e�ccavation :of the new a�addergroun describing recommended <br /> f the excavated soil. <br /> An addendum work plan will be prep <br /> procedures and methods for management ° tank. backfill soils <br /> Management options for .the existing or disposal of the <br /> include aeration on-site tperr�it required) , P <br /> soil' ata" Exxon approved landfill.: <br /> ! � 3) native soil data collected during <br /> the <br /> Preliminarily, <br /> assessment indicates that;aoil vapor extraction.is feasible <br /> 3) <br /> assessmeption or. mitigation of the impacted soils beneath' the <br /> existing UST basin. <br />