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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 />TABLE OF CONTENTS <br />1.0 INTRODUCTION............................................................................................................. 1 <br />1.1. PROJECT OBJECTIVES AND SCOPE................................................................................. <br />2 <br />1.2. PROJECT SITE DESCRIPTION.......................................................................................... <br />3 <br />1.2.1. Site Setting........................................................................................................... <br />3 <br />1.2.2. Previous Environmental Investigations.................................................................. <br />4 <br />1.2.3. Conceptual Site Model.......................................................................................... <br />6 <br />1.3. TREATABILITY STUDY TECHNOLOGY DESCRIPTION.......................................................... <br />7 <br />1.3.1. Soil Vapor Extraction............................................................................................ <br />7 <br />1.3.2. Air Sparge Testing................................................................................................ <br />7 <br />1.3.3. High Vacuum Dual Phase Extraction.................................................................... <br />8 <br />2.0 TREATABILITY STUDY ACTIVITIES............................................................................. <br />9 <br />2.1. PRELIMINARY ACTIVITIES............................................................................................... <br />9 <br />2.1.1. Permitting............................................................................................................. <br />9 <br />2.2. WELL INSTALLATIONS.................................................................................................... <br />9 <br />2.2.1. Soil Vapor Extraction Well....................................................................................10 <br />2.2.2. Dual -Nested Air Sparge Well...............................................................................10 <br />2.2.3. Dual Phase Extraction / Monitoring Wells............................................................10 <br />2.3. SOIL EVALUATION/SAMPLING DURING WELL INSTALLATION.............................................11 <br />2.4. WELL DEVELOPMENT....................................................................................................12 <br />2.5. GROUNDWATER SAMPLING...........................................................................................12 <br />2.6. WELL SURVEYING.........................................................................................................13 <br />2.7. WASTE DISPOSITION.....................................................................................................13 <br />3.0 SVE TREATABILITY TEST...........................................................................................14 <br />3.1. PROCEDURES...............................................................................................................14 <br />3.1.1. Vacuum Vs. Flow Step Test.................................................................................15 <br />3.1.2. Induced Vacuum Measurement...........................................................................15 <br />3.1.3. Advective Airflow Measurement...........................................................................16 <br />3.1.4. Field Measurement of Vapor Concentrations.......................................................16 <br />3.1.5. Vapor Sampling...................................................................................................16 <br />3.2. RESULTS......................................................................................................................16 <br />3.2.1. Vacuum Vs. Flow Step Test.................................................................................16 <br />3.2.2. Induced Vacuum Measurements..........................................................................17 <br />3.2.3. Advective Air Flow Measurements.......................................................................17 <br />3.2.4. Field Measurements of Vapor Concentrations.....................................................18 <br />OTIE vi <br />