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VIZI <br /> INC <br /> ' APPENDIX Ill <br /> • ACTIVE SOIL GAS SAMPLING PROTOCOL <br /> ' 10 INTRODUCTION <br /> I <br /> ' Soil gas samples will be collected by Einarson, Fowler and Watson (EWF) using small- <br /> diameter probes that are inserted into the ground using hydraulically-powered, direct push <br /> ' techniques A variety of tools and sampling methods are used for soil gas sampling <br /> depending upon the objectives of the investigation, the geologic characteristics of the <br /> subject site, and the analytical methods utilized for sample analysis In general, the probe <br /> is pushed or hammered into the ground to the target depth, pulled back to expose a <br /> specific interval, and a vapor sample is extracted from the tip of the probe using an applied <br /> vacuum The probe rods and down-hole sampling tools used by EWF are manufactured <br /> 1 by Geoprobe Systems The above-ground components of the vacuum sampling system <br /> utilized for extracting the vapor sample were designed and built by EWF <br /> 1 <br /> 1 <br /> 1� <br /> �i <br /> APPENDIX Ill <br /> 12270020 025 1 <br /> r <br />