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C <br /> €e <br /> k <br /> i <br /> i <br /> - t <br /> TABLE X I <br /> Soil and Ground Water Corrective Action Alternatives <br /> CALIFORNIA FUELS CARDLOCK STATION <br /> 2402 Pacific Avenue,Stockton,California <br /> 4 "Method' a rz ' € Ea !1 �" "a` "5 : t Typical 11+It1tiltOnng ' <br /> age;a., M r r q ��--w_ Advantages 1]isadvaniages,,t_ 3 %p F.a Momlanng and +, a �'zbz« {��1�SStltnB 1)11radUtt _ i <br /> y- <br /> Ld.�. _ M$ e, s .r _1 a " ^ '' �` ��M81ntC�lanee tr„ `1S' � UkrG#�ltilt5y, $-,.. W <}� , '• is it <br /> n-situ Soil Vapor •Easily combined with other methods Greater than 90%reduction of contaminants $30,000 to$60,000 Weekly and monthly 12 to 24 months <br /> Extraction (i c IAS)-Readily available generally not attainable•Large initial annually vapor sampling,semi- ' <br /> equipment•Conducive site equipment cost•Supplemental fuel required annual or annual soil <br /> Section 8 1 conditions-Relatively rapid cleanup and costs can be excessive as contaminants sampling <br /> period(12 to 24 months)•Can decrease•Air permitting required•Only r <br /> cleanup contaminated soil under non-saturated soils cleaned up•Effectiveness <br /> structures decreases with less permeable material <br /> Excavation •Theoretical removal of 100%of •Cost-effectiveness decreases with depth of S 107,200 to$160,800 Monitoring of I month for <br /> contaminants•Relatively short contamination-Cannot cleanup under for excavation,disposal excavated soil, excavation and <br /> Section 8 2 remediation period•Effective structures•Excavated soil must be treated or and backfill-does not collection of soil disposal,6 to 12 <br /> remediation of all soil types disposed-Backfill material and compaction include disruption to samples upon months if soil <br /> costs can be excessive•Disruption of day to business or building completion of treatment is , <br /> _ day business demolitionlrepair excavation required ► <br /> n-situ •Relatively simple design and •Regulatory approval can be difficult to $55,000 to$I 10,000 Monthly monitoring or 18 to 36 months <br /> ioremediation operation •Works well in most soil obtain•Additional inoculations and nutrient total cost organic vapor,carbon x <br /> Soil) types where no biotoxicity is present supplementation sometimes necessary•Less dioxide and dissolved <br /> effective in soils with high concentrations of oxygen,quarterly <br /> kerion 8 3 hydrocarbons,low nutrients or low%of ground water/soil <br /> hydrocarbon biodegraders sample collection . <br /> >r, <br /> Natural •Lower costs than most active •Not effective for higher contaminant $11,000 to$30,000 Installation of unknown ` <br /> Attenuation remedial alternatives•Minimal concentrations•Migration of contamination annually additional borings, <br /> disturbance to the site•Potential use may occur•Longer time frame than active Ground water <br /> Section 8 4 below structures remediation•May not achieve cleanup levels monitoring <br /> within reasonable length of time-Less <br /> effective in soils with high concentrations of <br /> hydrocarbons,low nutrients or low%of r <br /> h drocarbon biode raders <br /> s <br /> Advcxctd GeoEnvironmental,Inc. E <br /> t <br /> { <br /> t t� <br /> r <br /> t <br />