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SOIL GAS SURVEYS <br /> U Most subsurface contaminants (e,g, gasoline oil <br /> and carious <br /> chemical(s) contain volatile comtlonents that migrate to the <br /> surface, These gaseous components can be sampled at shallow <br /> depths <br /> is to delineate the composition, extent, and magnitude of subsurface <br /> contamination. Consegt►ently, soil gas surveys are usually the <br /> Optimum first step in soil and groundwater investigations for <br /> ® <br /> locating contamination, determining its source, and in focusing <br /> reirediatimn efforts. <br /> TYPICAL SOIL GAS SURVEY RESULTS <br /> • SAMPLE STATEON • <br /> LOCATIONS <br /> • <br /> SURIEO TANK ' • <br /> • <br /> t� ... • ,a rya. f • •� <br /> • <br /> -- - - - _ - - -- - -- -- - <br /> • <br /> • <br /> VOLATILES MAP ZHOWING AREAS OF GASOLINE MIGRATION IIN ppb) <br /> doll gas ar,plications include,, <br /> Screening of site to determine extent, composition and <br /> magnitude of contamination. <br /> Location of source of contamination <br /> ----Provide--basis- for monitoring Ne11 and/or recovery well site <br /> selection monitoring of remediation efforts. <br /> Past-remediation evaluation <br />