Section 7.15 Documentation of Soil Vapor or Indoor Air Samplingħ-1 Example Vapor Plume Contours and Vapor Intrusion Pathways.ħ-2 Conceptual Model of Soil Vapor Transport Including Biodegradation Process.ħ-3 Complete Exposure Pathway CSM for Soil Vapor to Indoor Air.ħ-4 Schematic of Soil Vapor Concentration Profile.ħ-5 Summa Canisters (spherical and cylindrical containers) with Flow Controllers (smaller gauges and blue box).ħ-6 Summa Canister and Flow Controller Setups (note smaller flow controller on left).ħ-7 Summa Canister and Flow Controller Parts.ħ-8 One-liter Tedlar Bag with Disposable Syringe and Three-way Valve for Filling.ħ-10 Two Examples of Passive Soil Vapor Sample Collectors.ħ-11 Two Examples of Indoor Air Passive Sample Collectors.ħ-13 Summary of high-density, passive sampler data for PCE vapors beneath the slab of a former dry cleaner.ħ-14 Designation of soil vapor DU beneath a building slab for collection of LVP samples.ħ-15 Example options for designation of purge points for collection of LVP subslab vapor samples. Section 7.13 Soil Vapor And Indoor Air Sample Analysisħ.13.1.1 Volatile Organic Compounds (VOCs)ħ.13.1.2 Total Volatile Petroleum Hydrocarbonsħ.14.3 Additional Evaluation and Remedial Actions Section 7.12 Passive Soil Vapor and Indoor Air Sample Collection Procedures Section 7.11 Active Indoor Air Sample Collection Proceduresħ.11.5 Indoor Air Sample Containers And Analytical Methods Section 7.10 Active Soil Vapor Sampling Proceduresħ.10.1 Soil Vapor Sample Timing and Frequencyħ.10.3.2 Vacuum Conditions and Tight Soilsħ.10.5.3 Tracer Method 1 – Application of Tracer Gas to Surface Completion Point Onlyħ.10.5.4 Tracer Method 2 – Application of Tracer Gas to Entire Sampling Apparatusħ.10.5.5 Tracer Gas Concentration Measurementħ.10.5.6 Selection of Leak Check Compoundħ.10.6 Soil vapor sample collection steps Section 7.9 Active Soil Vapor Probe Installationħ.9.3 Additional Recommendations for Subslab Probes Section 7.8 Sampling Approaches and Equipmentħ.8.3.1 Passive Soil Vapor Sample Collectorsħ.8.4.1 Investigation Objectives and LVP DU Designationħ.8.4.2 LVP Sample Point Designation and Slab Preparation Section 7.7 Indoor Air Sampling Strategiesħ.7.1 Determining When to Collect Indoor Air Samples Section 7.6 Soil Vapor Sampling Strategiesħ.6.1 Determining When to Collect Soil Vapor Samplesħ.6.2.2 Soil Vapor Sampling Point Locationsħ.6.2.3 Soil Vapor Sample Depths and Depth Intervalsħ.6.2.4 Soil Vapor Sample Screen Intervals Section 7.5 Collection of Representative Soil Vapor Samples Section 7.3 Development of Vapor Intrusion Screening Tools Section 7.2 Soil Vapor Transport Mechanisms and Conceptual Site Modelsħ.2.1 Factors Affecting Subsurface Vapor Flow and Impacts to Indoor Airħ.2.2 Preparation of Conceptual Site Models for Soil Vapor Investigations Section 7.1 Occurrence of Subsurface Vapor Plumes