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ADVISORY - ACTIVE SOIL GAS INVESTIGATIONS <br />FIGURES <br />Figure 1 <br />Figure 2 <br />Figure C-1 <br />Figure C-2 <br />Figure G-1 <br />Figure G-2 <br />Typical Single and Multiple Soil Gas Probe Design 11 <br />Sub-Slab Vapor Probe Typical Diagram 19 <br />Shroud Components 0-3 <br />Shroud Components-Purge Conditions 0-4 <br />Soil Drainage Curves (Gardner et al., 1970) G-23 <br />Soil Drainage Curves (Sisson et al., 1980) G-24 <br />TABLES <br />Table 1 <br />Table 2 <br />Table B-1 <br />Table E-1 <br />Table F-1 <br />Table F-2 <br />Table F-3 <br />Table F-4 <br />Soil Gas Sample Holding Time 34 <br />Preferred Analytical Methods and Modifications 36 <br />Tubing Type Study Results B-2 <br />Comparison of Methodologies E-6 <br />USEPA Soil Gas Testing Methods F-3 <br />Advantages and Disadvantages of Sample Introduction Techniques F-5 <br />Advantages and Disadvantages of Modifications to TO-15 F-9 <br />Reporting Limits F-19 <br />APPENDICES <br />Appendix A <br />Appendix B <br />Appendix C <br />Appendix D <br />Appendix E <br />Appendix F <br />Appendix G <br />Appendix H <br />Passive Soil Gas Method <br />Polymer Gas Sampling Bags and Tubing Types <br />Quantitative Leak Testing Using a Tracer Gas <br />Soil Gas Sampling in Low Permeability Soil <br />Naphthalene Soil Gas Collection <br />Soil Gas Analytical Method Review <br />Barometric Pressure, Rainfall, and Soil Drainage <br />Reporting Format and Parameters <br />July 2015 vi