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rt - x <br /> . r <br /> a <br /> };I <br /> 1i <br /> pRE.TAYK REPLACEMENT SITE ASSESSMENT <br /> ^ RESULTS REPORT <br /> 1605 5,D Dorado,Stockton.CaiNoff" - <br /> Pape a <br /> Wa <br /> IB B ON <br /> Based on the results of soil analytical testing and field <br /> screening, soils beneath the UST basin are impacted with petroleum <br /> _ <br /> determined. <br /> The horizontal the <br /> vertical extent of TFH impact does <br /> detern►ined. Frelieinarily, approximately 40 feet below <br /> not appear to extend below a depth of app <br /> grade. <br /> Based on the results of the lluviallynd field deposited sandsations, the <br /> silts and <br /> site geology is dominated by <br /> clays. These soils are thinly interlayered y varied geologic <br /> fand <br /> present a complex soil profile with widely <br /> engineering properties. These varied characteristics may be <br /> responsible for the wide variance in the analytical data. <br /> 5,o CONCLUSIONS <br /> nclusions regarding the replacement of <br /> Aegis offers the following co <br /> .: underground fuel: storage tanks and product lines at the site: <br /> tank coain1) Native soilaroundgasoline at detectable alsin e else Thepdepth�at <br /> hydrocarbons as g <br /> which impacted soils were encountered would generally.preclude <br /> the mitigation option of excavation of the .soil. <br /> �: 2) <br /> it is proposed to replace the existing tanks with new 12,Og0- <br /> gallon tanks in a basin which will exist partially within the <br /> Approximately <br /> old basin. 304 cubic yards of soil would be <br /> excavated during the tank closure to allow for tank removal. <br /> An additional 350 cubic yards of soil will be excavated from <br /> the extended excavation.of the new underground storage tanks. <br /> be ended <br /> An addendum work plan s far managemwi ent ofared sthebexcavatedmsoil. <br /> procedures and meth tank backfill soils <br /> ' Management . options for the existing <br /> incT_ude aeration on-site (permit required], or disposal of the <br /> soil at an Exxon approved landfill. <br /> 3) Preliminarily, native soil data collected during the <br /> assessment indicates that soil vapor extraction is a feasible <br /> option for mitigation of the impacted soils beneath the <br /> existing UST basin. <br /> s0.2050.RPT <br />