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Pre-Design Investigation Workplan <br /> Former Manufactured Gas Plant— Lodi, California <br /> TABLE OF CONTENTS <br /> Page <br /> LISTOF TABLES.........................................................................................................................................Ili <br /> LISTOF FIGURES.......................................................................................................................................III <br /> LISTOF APPENDICES................................................................................................................................III <br /> LIST OF ACRONYMS AND ABBREVIATIONS...........................................................................................iv <br /> ACKNOWLEDGMENT AND SIGNATURE PAGE........................................................................................v <br /> 1.0 INTRODUCTION..............................................................................................................................1 <br /> 2.0 BACKGROUND...............................................................................................................................2 <br /> 2.1 SITE LOCATION AND DESCRIPTION...................................................................................................2 <br /> 2.2 SITE HISTORY................................................................................................................................2 <br /> 2.3 SITE GEOLOGY...............................................................................................................................3 <br /> 2.4 SITE HYDROGEOLOGY.....................................................................................................................4 <br /> 2.5 SUMMARY OF PREVIOUS INVESTIGATIONS, REMEDIAL ACTIONS AND DEED RESTRICTIONS....................4 <br /> 2.5.1 Site Screening Investigation (1985).........................................................................................4 <br /> 2.5.2 Surface Soil Sampling (2006)..................................................................................................5 <br /> 2.5.3 Cultural Resources Survey(2007)...........................................................................................5 <br /> 2.5.4 Water Supply Well Destruction Activities (2009)......................................................................6 <br /> 2.5.5 Remedial Investigation (2008—2010) .....................................................................................6 <br /> 2.5.6 Soil Vapor Extraction Pilot Testing (2010) ...............................................................................7 <br /> 2.5.7 Removal Action Workplan........................................................................................................8 <br /> 3.0 PROPOSED SCOPE OF INVESTIGATION ACTIVITIES ................................................................9 <br /> 4.0 FIELD PROCEDURES...................................................................................................................11 <br /> 4.1 PERSONNEL AND PROCEDURES.....................................................................................................11 <br /> 4.2 PERMITTING AND ACCESS .............................................................................................................11 <br /> 4.3 HEALTH AND SAFETY PLAN............................................................................................................11 <br /> 4.4 UTILITY CLEARANCE.....................................................................................................................11 <br /> 4.5 DRILLING AND SOIL SAMPLING PROCEDURES..................................................................................12 <br /> 4.6 TRENCHING PROCEDURES.............................................................................................................13 <br /> 4.7 SOIL GAS PROBE INSTALLATION PROCEDURES...............................................................................14 <br /> 4.7.1 Dual-Depth Semi-Permanent Soil Gas Probe Construction...................................................14 <br /> 4.8 SOIL GAS SAMPLE COLLECTION PROCEDURES ...............................................................................15 <br /> 4.8.1 Equilibration Time..................................................................................................................15 <br /> 4.8.2 Leak Test...............................................................................................................................15 <br /> 4.8.3 Purge Volume Test................................................................................................................16 <br /> Q RRA PACIFIC GROUP Page ii April 4, 2012 <br />