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+ v JJ <br /> TABLE 11 <br /> Soil and Ground Water Corrective Action Alternatives <br /> FLAG CITY CHEVRON <br /> 6421 Capitol Avenue,Lodi,CaIifonma g <br /> * -t����'�d 32� <br /> a r+ <br /> r,-Method Advantages , <br /> v Disadvantages ` `"° g , Typical'MonitonngQ Esti ted Duration <br /> g ,Monitonn and i> <br /> r ° Requiremcnts u <br /> Maintenance <br /> In-situ Air Combines well with SVE•Readily •initial equipment/design costs can be costly $5,000 to$10,000 Monthly groundwater unknown <br /> parging available equipment•Little •air flow channeling-Effectiveness decreases annually,$34,000 to depth measurements, <br /> equipment maintenance required with less permeable material $45,000 start-up cost monthly sample <br /> Seclion 9 1 collection <br /> Pump and Treat •Rapid reduction in high •High volumes of extracted water will $208,000 to 416,000 Quarterly or monthly 24 to 36 months <br /> concentrations•Prevent spreading of require disposal •Typically unable to achieve on-site total cost,off- monitoring,analysis of <br /> Section 9 2 plume cleanup goals•Equipment can be costly site cost could exceed extracted water <br /> $2,820,200 <br /> In-situ •Relatively simple design and •Usually no immediate reduction in $25,000 to Monthly ground water unknown <br /> ioremediation application process•Little or no hydrocarbon concentrations•Remediation $40,000 total cost and vapor sampling, <br /> Ground Water) maintenance required controls difficult to implement•Regulatory annually,start up quarterly monitoring, <br /> acceptance difficult to obtain•Waste between$45,000 and microbiological <br /> Section 9 3 discharge permits sometimes required• $75,000 analysis of samples <br /> MTBE biodegrades slowly <br /> Natural •Lower costs than most active •Not effective for higher contaminant $6,000 to$20,000 Quarterly ground water unknown <br /> Attenuation remedial alternatives•Minimal concentrations•Migration of contamination annually monitoring <br /> disturbance to the site•Potential use may occur•Longer time frame than active <br /> eclion 9 4 below structures remediation•May not achieve cleanup levels <br /> within reasonable length of time•Not <br /> generally permitted when free product is <br /> resent,MTBE biodegrades slowly <br /> Advanced GeoEnvironmental,Inc <br />