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ADVISORY - ACTIVE SOIL GAS INVESTIGATIONS <br />TABLE OF CONTENTS <br />FOREWORD <br />ACKNOWLEDGMENTS <br />ACRONYMS <br />1.0 INTRODUCTION <br />2.0 INITIAL PROJECT PLANNING AND WORKPLAN DEVELOPMENT <br />2.1 Study Purpose and Data Quality Objectives <br />2.2 Technical Documents <br />2.3 Workplan <br />2.3.1 Elements of the Workplan <br />2.3.2 Conceptual Site Model <br />2.3.3 Sampling and Analysis Plan <br />2.4 Soil Gas Investigation Reports <br />page <br />ii <br />iii <br />vii <br />1 <br />2 <br />2 <br />3 <br />3 <br />3 <br />4 <br />5 <br />6 <br />3.0 SOIL GAS INVESTIGATION DESIGN 7 <br />3.1 Location, Spacing and Depth 7 <br />3.1.1 Lithology 7 <br />3.1.2 Sample Spacing 8 <br />3.1.3 Sample Depth 8 <br />3.2 Installation Procedures 9 <br />3.2.1 Installation Methods and Design 9 <br />3.2.2 Sampling Tubing 11 <br />3.2.3 Drive Point Method 13 <br />3.3 Soil Gas Well Completion 13 <br />3.4 Decommissioning 14 <br />3.5 Decontamination 15 <br />3.6 Sub-Slab Investigation Methods 15 <br />3.6.1 High Purge Volume Sub-Slab Sampling 17 <br />4.0 SOIL GAS SAMPLE COLLECTION 20 <br />4.1 Equilibration Time 20 <br />4.2 Soil Gas Assembly Tests 21 <br />4.2.1 Shut-In Test 21 <br />4.2.2 Leak Test 21 <br />4.2.2.1 Leak Check Compounds (Liquid) 21 <br />4.2.2.2 Leak Check Compounds (Gaseous) 22 <br />4.2.2.3 Leak Check Considerations 22 <br />4.2.3 Purging 23 <br />4.3 Purge/Sample Flow Rate and Applied Vacuum 24 <br />4.3.1 Vacuum Pump 24 <br />5.0 SAMPLE HANDLING AND TRANSPORT 24 <br />5.1 Sample Containers 24 <br />5.1.1 Syringes 25 <br />July 2015 iv