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011 * • <br /> TABLE 1 I <br /> Soil and Ground Water Corrective Action Alternatives <br /> FLAG CITY CHEVRON <br /> 6421 Capitol Avenue,Lodi,California <br /> „j. '" a <br /> (� � R�'6tlTnated Costs�1nCl`� a <br /> " Method Advantages M a Y Disadvantages ;=r`'dMonrtonng and', f �Typical Monrtonng trmated Duration <br /> Maintenance " '�'Requrremcnts . 5.�''A—If <br /> hi-situ Soil Vapor •Easily combined with other methods Greater than 90%reduction of contaminants $40,000 to$50,000 Weekly and monthly 36 to 48 months <br /> Extraction (i a IAS)•Readily available generally not attainable•Large initial annually vapor sampling,semi- <br /> equipment• Can cleanup equipment cost•Supplemental fuel required annual or annual soil <br /> Seclaorr 8 1 contaminated soil under structures and costs can be excessive as contaminants sampling <br /> decrease•Air permitting required•Only <br /> non-saturated soils cleaned up•Effectiveness <br /> decreases with less permeable material <br /> Excavation •Theoretical removal of 100%of •Cost-effectiveness decreases with depth of $267,000 to$334,000 Monitoring of I month for <br /> contaminants•Relatively short contamination•Cannot cleanup under for excavation,disposal excavated soil, excavation and <br /> ection 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 /> rr-situ •Relatively simple design and •Regulatory approval can be difficult to $120,000 to$235,000 Monthly monitoring or unknown <br /> ioremediation operation •Works well in most sod obtain•Additional inoculations and nutrient total cost organic vapor,carbon <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 /> Section 8 3 hydrocarbons,low nutrients or low%of ground water/soil <br /> hydrocarbon biodegraders•MTBE sample collection <br /> biodegrades slowly <br /> Natural •Lower costs than most active •Not effective for higher contaminant $11,000 to$22,000 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 <br /> h drocarbon biode raders <br /> Advanced GeoEnvironmental,Inc <br />