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ADVISORY - ACTIVE SOIL GAS INVESTIGATIONS <br /> <br />5.1.2 Passivated Stainless Steel Canisters <br /> <br />5.1.3 Polymer Gas Sampling Bags or Glass Bulbs <br /> <br />5.1.4 Sorbent Tubes <br /> <br />5.1.5 Alternate Sample Containers <br />25 <br />25 <br />26 <br />26 <br />5.2 Field Conditions 26 <br />5.2.1 Rainfall and Barometric Pressure (See Appendix G) 26 <br />5.2.2 Wet Conditions 27 <br />5.2.3 Soil Gas Sampling in Low-Permeability Soil 27 <br />5.2.4 Drilling Refusal 28 <br />5.3 Sample Container Handling 28 <br />5.3.1 Syringes and Glass Bulbs 28 <br />5.3.2 Sorbent Tubes 29 <br />5.3.3 Polymer Gas Sampling Bags 29 <br />5.3.4 Passivated Stainless Steel Canisters 29 <br />5.4 Sample Container Cleanliness and Decontamination 29 <br />5.5 Chain of Custody Records 30 <br />6.0 ANALYSIS OF SOIL GAS SAMPLES 30 <br />6.1 Target Compounds 30 <br />6.1.1 Common Organic Compounds 30 <br />6.2 Reporting Limits for Target Compounds 32 <br />6.3 Quality Assurance/Quality Control 32 <br />6.3.1 Sample Blanks 33 <br />6.3.2 Field Duplicate/Replicate Samples 33 <br />6.3.3 Laboratory Control Samples 34 <br />6.3.4 Split Samples 34 <br />6.3.5 Holding Times 34 <br />6.4 Analytical Methods 34 <br />6.5 Soil Gas Sample Analysis and Laboratory Reporting 39 <br />6.5.1 Analytical Methods 39 <br />6.5.2 Contaminant Reporting 39 <br />6.5.3 Leak Check Compounds 39 <br />6.5.4 Auto Samplers 39 <br />7.0 METHANE AND HYDROGEN SULFIDE SAMPLING PROGRAMS 40 <br />7.1 Methane 40 <br />7.1.1 Methane Field Collection 40 <br />7.1.2 Methane Laboratory Analysis 40 <br />7.2 Hydrogen Sulfide 40 <br />7.2.1 Sample Containers 41 <br />7.2.2 Hydrogen Sulfide Field Collection 41 <br />7.2.3 Precautions Particular to Hydrogen Sulfide 41 <br />8.0 LABORATORY CERTIFICATION 42 <br />9.0 REFERENCES 43 <br />July 2015 v