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Unit hates Solid Waste and EPA 510-F-93-021 <br /> Envn mental Protection Emergency Respo..w3 October 1993 <br /> Agency `ivy <br /> =CEPA Soil Remediation For <br /> UST Sites <br /> In Situ Soil Vapor <br /> Extraction <br /> ITn situ soil vapor extraction (SVE) is a technique for <br /> removing contaminants from unsaturated soils. The <br /> technique draws fresh air into the ground with a vacuum <br /> pump. The air brings the contaminants to the surface, <br /> where they can be treated and safely discharged. <br /> In situ sail vapor extraction is most effective in <br /> coarse-grained soils such assand and gravel. It requires a <br /> minimum 5-foot-thick unsaturated zone of soil. This <br /> technique can be used in conjunction with air sparging, <br /> groundwater pumping, or bioremediation systems. <br /> This technique is able to treat large volumes of soil <br /> effectively and with minimal disruption to business - <br /> operations It also can remove contamination from near <br /> or under fixed structures. <br /> Petroleum Types And Constituents <br /> • Fresh and weathered gasoline and diesel <br /> • Volatile organic compounds (VOCs) such as <br /> benzene, toluene, ethylbenzene, and xylene <br /> (BTDQ; and semivolatlle organic compounds <br /> (SVOCs): <br />