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TABLE OF CONTENTS <br /> CERTIFICATION........................................................................................................................... I <br /> EXECUTIVESUMMARY .............................................................................................................1 <br /> 1.0 INTRODUCTION.....................................................................................................................7 <br /> 1.1 GENERAL INFORMATION..........................................................................................................7 <br /> 1.2 PURPOSE AND OBJECTIVE........................................................................................................7 <br /> 1.3 PUBLIC PARTICIPATION ACTIVITIES.....................................................................................7 <br /> 1.4 REPORT ORGANIZATION...........................................................................................................8 <br /> 2.0 SITE SETTING AND BACKGROUND INFORMATION....................................................10 <br /> 2.1 SITE LOCATION.......................................................................................................................... 10 <br /> 2.2 SITE SETTING............................................................................................................................. 10 <br /> 2.2.1 Topography and Drainage.................................................................................................10 <br /> 2.2.2 Geology and Soil Types....................................................................................................10 <br /> 2.2.2.1 Site Specific Lithology......................................................................................11 <br /> 2.2.3 Hydrogeology...................................................................................................................11 <br /> 2.2.4 Climatology......................................................................................................................12 <br /> 2.3 CURRENT SITE OWNERSHIP AND HISTORICAL LAND USE............................................ 12 <br /> 2.3.1 Property Ownership..........................................................................................................12 <br /> 2.3.2 Previous Facility Ownership/Operators............................................................................12 <br /> 2.4 SURROUNDING LAND USE...................................................................................................... 13 <br /> 2.5 BACKGROUND INFORMATION.............................................................................................. 14 <br /> 2.5.1 Site Operations..................................................................................................................14 <br /> 2.5.2 Site Features......................................................................................................................14 <br /> 2.5.3 Nature of Site Operations .................................................................................................15 <br /> 2.5.4 Previous Site Investigations..............................................................................................15 <br /> 2.5.4.1 Preliminary Assessment.................................................................................... 15 <br /> 2.5.4.2 Underground Storage Tank Investigations........................................................ 16 <br /> 2.5.4.3 Long Term Groundwater Monitoring for UST Wells....................................... 17 <br /> 2.5.4.4 Site Investigation at the Tracy MGP Site.......................................................... 17 <br /> 3.0 REMEDIAL INVESTIGATION ACTIVITIES......................................................................19 <br /> 3.1 OVERVIEW.................................................................................................................................. 19 <br /> 3.2 FIELD INVESTIGATION PROGRAM........................................................................................ 19 <br /> 3.2.1 Utility Survey/Geophysical Clearance..............................................................................19 <br /> 3.2.2 Soil Sampling Procedures.................................................................................................20 <br /> 3.2.3 Soil Gas Sampling Procedures..........................................................................................21 <br /> 3.2.3.1 Soil Gas Probe Construction.............................................................................21 <br /> 3.2.3.2 Soil Gas Sample Collection...............................................................................22 <br /> 3.2.4 Well Installation and Groundwater Sampling Procedures................................................24 <br /> 3.2.4.1 Well Installation and Development Procedures................................................24 <br /> PARSONS 11 FINAL RI REPORT-FORMER TRACY MGP <br /> APRIL 2010 <br />