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Treatability Study Report and Feasibility Evaluation for <br />In Situ Petroleum Hydrocarbon Remediation <br />Field Maintenance Shop #24, 8020 South Airport Way <br />Stockton, California <br />3.2.5. <br />Vapor Sample Results.........................................................................................18 <br />3.2.6. <br />Radius of Influence for Vapor Extraction..............................................................18 <br />3.2.7. <br />Vapor Mass Removal...........................................................................................19 <br />4.0 AIR SPARGE TREATABILITY TEST............................................................................20 <br />4.1. EQUIPMENT INSTALLATION............................................................................................20 <br />4.2. TESTING PROCEDURES.................................................................................................20 <br />4.2.1. <br />Step Testing........................................................................................................21 <br />4.2.2. <br />Pressure Response Monitoring............................................................................21 <br />4.2.3. <br />Helium Injection and Monitoring...........................................................................21 <br />4.2.4. <br />Dissolved Oxygen Monitoring..............................................................................21 <br />4.2.5. <br />Field Measurements of Vapor Concentrations.....................................................21 <br />4.2.6. <br />Groundwater Sampling........................................................................................22 <br />4.2.7. <br />Vapor Sampling...................................................................................................22 <br />4.3. RESULTS <br />......................................................................................................................22 <br />4.3.1. <br />Step Test.............................................................................................................22 <br />4.3.2. <br />Pressure Response.............................................................................................22 <br />4.3.3. <br />Helium Monitoring................................................................................................23 <br />4.3.4. <br />Depth to Water Monitoring...................................................................................24 <br />4.3.5. <br />Dissolved Oxygen Monitoring..............................................................................24 <br />4.3.6. <br />Groundwater Concentrations...............................................................................25 <br />4.3.7. <br />Field Measurements of Vapor Concentrations.....................................................25 <br />4.3.8. <br />Vapor Concentrations..........................................................................................26 <br />4.3.9. <br />Zone of Influence.................................................................................................26 <br />5.0 HVDPE TREATABILITY TEST......................................................................................28 <br />5.1. HVDPE EQUIPMENT.....................................................................................................28 <br />5.2. TESTING <br />PROCEDURES.................................................................................................28 <br />5.2.1. <br />Vacuum Versus Flow Step Testing......................................................................29 <br />5.2.2. <br />Depth to Water Monitoring...................................................................................29 <br />5.2.3. <br />Induced Vacuum Monitoring................................................................................29 <br />5.2.4. <br />Advective Airflow Measurement...........................................................................30 <br />5.2.5. <br />Field Measurements of Vapor Concentrations.....................................................30 <br />5.2.6. <br />Vapor Sampling...................................................................................................30 <br />5.2.7. <br />Groundwater Sampling........................................................................................30 <br />5.3. RESULTS......................................................................................................................30 <br />5.3.1. <br />Vacuum Versus Flow Test Results......................................................................30 <br />5.3.2. <br />Depth to Water Monitoring...................................................................................31 <br />5.3.3. <br />Induced Vacuum Measurements..........................................................................31 <br />OTIE vii <br />