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v <br /> S. <br /> w <br /> s' <br /> Woodward-Clyde Consuttaots <br /> .-� Table 7 Continued Disadvantages <br /> Technology Description <br /> Advantage <br /> Prevents off-site Requires treatment o1 <br /> extracted groundwater. <br /> Ground Water Plume Control by ration of Treatment can be <br /> Contamination installation of a series co accomplished using all <br /> consist of suited for immediate air sirippin9 column. <br /> >=xtractian;Gn-Site Conirols rniaycontrols. contaminants. Wel- alternative may <br /> a series of extraction application g o the This alte <br /> Caltrans Shop 10 require air and <br /> wells, or cut-off facility. Both injection well permits, <br /> trenches. Monil°ring dissolved-and free for <br /> - <br /> downgradient of the rase hydrocarbons can endo dd1tmonitorinysand <br /> system is required to Pongoing <br /> pumping, <br /> assess effectiveness. be recovered• Existence ong <br /> This alternative can be of c site cue P <br /> combined with the trench could reduce <br /> recovery. and recycling construction casts. <br /> of free product. <br /> Prevents off-site Requires extensive <br /> plume control by migration of knowledge Of the extent <br /> Graundwaler of contamination and <br /> Contamination installation of a series rs contaminants. <br /> Control! On-Site of hydraulicbartc) to Sepa:"tes contaminated flow conditions. <br /> and noncantaminanted Physical barriers are <br /> �� (e, slurry very expensive, and <br /> retard contaminant groundwater- Isolated <br /> migration. groundwater quality can 0 weaihering. <br /> subject <br /> oblg Term ma tence <br /> Woved by <br /> + je lmp- avid inspection costs <br /> naturally accuring expected. Dlfficull to <br /> bioremediation+ monitor the <br /> elfectiveness of <br /> naturally occurrin <br /> ocessas. <br /> remediation p <br /> 23 <br />