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Work Plan for Groundwater Monitoring Well Installation, <br /> Soil Gas and Groundwater Investigation, <br /> and Groundwater Monitoring <br /> Army Aviation Support Facility, Stockton, California <br /> TABLE OF CONTENTS <br /> 1.0 INTRODUCTION...............................................................................................................1 <br /> 1.1 PROJECT OBJECTIVES AND SCOPE..................................................................................2 <br /> 1.2 SITE LOCATION...............................................................................................................3 <br /> 1.3 SITE DESCRIPTION AND HISTORY.....................................................................................3 <br /> 1.4 SITE SETTING AND GEOLOGY..........................................................................................4 <br /> 1.5 REGIONAL AND SITE HYDROGEOLOGY.............................................................................5 <br /> 1.6 CONCEPTUAL SITE MODEL..............................................................................................5 <br /> 2.0 PREVIOUS ENVIRONMENTAL INVESTIGATIONS........................................................5 <br /> 2.1 UST REMOVALS .............................................................................................................6 <br /> 2.2 PREVIOUS GROUNDWATER MONITORING.........................................................................6 <br /> 2.3 FEBRUARY 2004 SITE INVESTIGATION..............................................................................6 <br /> 2.4 MARCH 2008 SITE INVESTIGATION...................................................................................7 <br /> 3.0 PROPOSED ACTIVITIES.................................................................................................7 <br /> 3.1 PERMITTING....................................................................................................................7 <br /> 3.2 SITE PREPARATION.........................................................................................................7 <br /> 3.3 AASF WASH RACK GROUNDWATER AND SOIL GAS INVESTIGATION ..................................8 <br /> 3.3.1 Grab Groundwater Sampling.................................................................................8 <br /> 3.3.2 Soil Gas Survey.....................................................................................................9 <br /> 3.3.2.1 Soil Gas Probe Depth.........................................................................................9 <br /> 3.3.2.2 Soil Gas Probe Emplacement............................................................................9 <br /> 3.3.2.3 Equilibrium Time...............................................................................................10 <br /> 3.3.2.4 Purge Volume Test...........................................................................................10 <br /> 3.3.2.5 Shut-in Testing .................................................................................................10 <br /> 3.3.2.6 Leak Testing.....................................................................................................10 <br /> 3.3.2.7 Purge/Sample Flow Rate..................................................................................10 <br /> 3.3.2.8 Filed QC Samples ............................................................................................11 <br /> 3.3.2.9 Field Condition Considerations.........................................................................11 <br /> 3.3.2.10 Decontamination and Borehole Abandonment.................................................11 <br /> 3.4 GROUNDWATER MONITORING WELL INSTALLATION.........................................................12 <br /> 3.5 SOIL SAMPLING DURING WELL INSTALLATION ................................................................12 <br /> 3.6 WELL DEVELOPMENT....................................................................................................13 <br /> 3.7 GROUNDWATER MONITORING WELL SAMPLING..............................................................13 <br /> 3.8 GROUNDWATER MONITORING WELL AND DIRECT-PUSH BORING SURVEYING..................14 <br /> 3.9 INVESTIGATION-DERIVED WASTE(IDW).........................................................................14 <br /> 4.0 REPORTING...................................................................................................................15 <br /> 4.1 COMBINED SITE INVESTIGATION REPORT.......................................................................15 <br /> 4.2 QUARTERLY GROUNDWATER MONITORING REPORTS.....................................................15 <br /> 4.3 FOURTH QUARTERLY GROUNDWATER MONITORING REPORT.........................................15 <br /> 5.0 PROJECT SCHEDULE ..................................................................................................16 <br /> 6.0 QUALITY CONTROL PLAN (QCP)................................................................................16 <br /> 6.1 NATURE AND PURPOSE OF PLAN ...................................................................................16 <br /> 6.2 PROJECT ORGANIZATION ..............................................................................................16 <br /> 6.2.1 Corporate Project QC Manager...........................................................................17 <br /> 6.2.2 Project QC Manager............................................................................................17 <br /> OTI E I <br />