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low <br /> Si a actio <br /> Advantages • Effectively treats large volumes (>1,000 cu yd) of soil <br /> • Removes contamination near or under fixed structures <br /> • Causes minimal disruption to business operations <br /> • Removes volatile contaminants from the zone of water <br /> table fluctuation <br /> Limitations • Effectiveness limited in heterogeneous soils or soils with _ <br /> - high clay or organic content <br /> •`Airflow may not contact all parts of soil <br /> • Leaves residual constituents in soil <br /> • Might require air discharge permits <br /> System • Vertical or horizontal extraction wells <br /> Components a Trenches <br /> Vacuum blower or pump <br /> • Ir{jection and passive inlet wells <br /> • Aboveground vapor treatment equipment(optional) <br /> Wastestreant 0Vapor treatment options (if needed): <br /> Treatment - vapor phase biordter' <br /> Granulated activated carbon <br /> - Internal combustion engine , <br /> Catalytic oaddation unit , <br /> Thermal incinerator.. <br /> Parameters to • _Vapor concentration - . - <br /> Monitors e-Airflow rate <br /> Cleanup Levels Can remove 90% of volatile organic compounds (VOCs) <br /> and Timing2 and semivolatile organic compounds (SVOCs) <br /> • For an ideal site,90%in 6 months to 1 year <br /> • For an average site', 90%in 6 months to 3 years <br /> • Longer time required for heterogeneous soils and less <br /> volatile constituents <br /> Costso For an ideal site3, $40,000 to $120,000 <br /> • For an average site, $100,000 to $150,000 <br /> • Vapor treatment costs can drastically affect total costs <br /> 'Varameters b mmitar•are�«pafartnanee putposee ardy,canpranee 9 paremdets�'M�& - - <br /> Cleanup star&rds are deternted by the sate. - - <br /> %9desl sde'assumes no delays n oonedNe action and a reWvey homagate m permeable aiMuface. - - <br /> 4An'awsapsle asames mFwW delays nomo* wlim ada modeiasyheteagm®us ad pameehlay^•Flace <br /> tools=we Kopmerit and operatbn and maiaenance. <br />