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DEPTH PROFILE OF BENZENE, 02, AND CO2 <br /> CO2and 02 Concentrations (%) <br /> 0 5 10 15 20 25 <br /> 0 <br /> 6 - <br /> 10 <br /> v <br /> L <br /> Y <br /> 15 <br /> 20 <br /> 25 <br /> 0.1 1 10 100 1,000 10,000 100,000 <br /> Benzene Vapor Concentration (ug/rrP) <br /> 0 Benzene A oz X cot <br /> Figure 13. Depth profile of benzene, 02, and CO2(by Chuck Zuspan, CVX ETC). <br /> VI. Additional resources <br /> A number of useful resources are available online or by contacting Brian Davis or Tom <br /> Peargin at Chevron ETC, including: <br /> A. Air Toxics Ltd. Guide to Air Sampling and Analysis <br /> B. API: Collecting and Interpreting Soil Gas Samples from the Vadose Zone(2004) <br /> ETC Soil Vapor Sampling Technical Toolkit 24 <br /> Version 1.4,September 7,2005 <br />