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ame& <br /> TABLE OF CONTENTS <br /> Page <br /> 1.0 INTRODUCTION .................:...........................................:..............................................1 <br /> 1.1 DOCUMENT ORGANIZATION.....?......:......................................................................1 <br /> 2.0 BACKGROUND INFORMATION................ <br /> 2.1 SITE DESCRIPTION AND SETTING.................................:..........................................2 <br /> 2.2 SUMMARY OF RELEASE AND INVESTIGATIONS........................................................2 <br /> 2.3 SITE LITHOLOGY AND HYDROGEOLOGY .................................................................3 <br /> u 2.4 REMEDIAL APPROACH...........................................................................................4 <br /> 3.0 PROPOSED FIELD ACTIVITIES..' 5 <br /> 3.1 SITE INVESTIGATION OBJECTIVES..................:.......................................................5 <br /> 3.2 PRE-FIELD ACTIVITIES...............................................................,.....:.....................5 <br /> 3.2.1 Health and Safety Plan............................................................................5 <br /> 3.2.2 Permitting and Site Access .....................................................................6 <br /> 3.2.3 Utility Location and Borehole Clearance.................................................6 <br /> 3.3 SOURCE AREA CHARACTERIZATION..........................................:............................6 <br /> 3.3.1 Boring Location and Rationale.................................................... ...........6 <br /> 3.3.1 Drilling Methodology 7 <br /> 3.3.3 Grab Groundwater Sampling...................................................................7 <br /> 3.3.4 Abandonment of Soil Borings...................................................................8 <br /> 3.4 WELL INSTALLATION..............................:...............................................................8 <br /> l 3.4.1 Rationale and Location............................................................................8 <br /> 3.4.2 Drilling and Well Installation Procedures...................................................8 <br /> 3.4.3 Soil Screening and Sampling................................... ..9 <br /> ............................ <br /> 3.4.4 Well Development and Survey10 <br /> 3.4.5 Groundwater Sampling...............................:....:.....................................10 <br /> 3.4 QUALITY ASSURANCE SAMPLING AND ANALYSIS ..................................................10 <br /> 3.5 SAMPLING LABELING AND SHIPPING.....................................................................11 <br /> 3.6 INVESTIGATION WASTE MANAGEMENT.................................................................11 <br /> 4.0 AIR SPARGING PILOT TEST ......................................................................................12 <br /> 4.1 RATIONALE AND OBJECTIVES ..............................................................................12 <br /> 4.2 PRE-FIELD ACTIVITIES.........................................................................................12 <br /> 4.2.1 Permitting and Site Access ...................................................................12 <br /> 4.3 PILOT TEST EQUIPMENT......................................................................................12 <br /> 4.4 PILOT TEST.PROCEDURES ..................................................................................13 <br /> 4.5 HELIUM TRACER TEST ........................................................................................13 <br /> 5.0 REPORTING <br /> ................................................:...............................................................14 <br /> 6.0 SCHEDULE ..................................................................................................................14 <br /> 7.0 REFERENCES ............................................................................................................'.15 <br /> AMEC Geomatrix, Inc. <br /> P:\Project\14000s\14443_Caltrans\TO 10\11000_PLAWAS WP—March 2010\HS WP.doc <br />