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SUPPLEMENTAL SITE INVESTIGATION WORK PLAN <br /> South Pointe Property <br /> Stockton, California <br /> Table of Contents <br /> 1.0 INTRODUCTION..........................................................................................................1.1 <br /> 2.0 SITE BACKGROUND ..................................................................................................2.1 <br /> 2.1 SITE DESCRIPTION AND OPERATIONS....................................................................2.1 <br /> 2.2 SITE GEOLOGY AND HYDROGEOLOGY...................................................................2.2 <br /> PREVIOUS SITE INVESTIGATIONS.......................................................................................2.2 <br /> 2.2.1 Geotechnical Assessment - 2006................................................................2.2 <br /> 2.2.2 Environmental Assessment - 2007..............................................................2.2 <br /> 2.2.3 Phase I ESA—2020....................................................................................2.4 <br /> 2.2.4 Phase I I ESA—2021 ...................................................................................2.5 <br /> 3.0 CONCEPTUAL SITE MODEL......................................................................................3.1 <br /> 3.1 HISTORICAL CHEMICAL SOURCE AREAS................................................................3.1 <br /> 3.2 GROUNDWATER CONDITIONS .................................................................................3.2 <br /> 3.3 SOIL VAPOR CONDITIONS ........................................................................................3.2 <br /> 3.4 HISTORICAL SOIL EXCAVATION AND DISPOSITION OF SOIL STOCKPILES.........3.3 <br /> 3.4.1 2008 Soil Stockpile — Promenade and South Pointe Properties ..................3.3 <br /> 3.4.2 Removal of 500 Cubic Yards of Promenade Soil.........................................3.3 <br /> 3.5 CURRENT CONDITIONS AND EXTENT OF ORGANOCHLORINE PESTICIDES <br /> AND LEAD IN SOIL......................................................................................................3.4 <br /> 4.0 SCOPE OF WORK.......................................................................................................4.1 <br /> 4.1 INVESTIGATIVE APPROACH......................................................................................4.1 <br /> 4.1.1 Soil Assessment..........................................................................................4.1 <br /> 4.1.2 Groundwater Assessment...........................................................................4.2 <br /> 4.2 ANALYTICAL METHODS AND SCREENING CRITERIA.............................................4.3 <br /> 4.3 PRE-FIELD ACTIVITIES ..............................................................................................4.3 <br /> 4.3.1 Health and Safety Plan................................................................................4.3 <br /> 4.3.2 Utility Clearance..........................................................................................4.3 <br /> 4.3.3 DTSC Approval and Notifications................................................................4.4 <br /> 4.3.4 Permitting....................................................................................................4.4 <br /> 4.4 SOIL AND GROUNDWATER SAMPLING....................................................................4.4 <br /> 4.4.1 Soil Sampling..............................................................................................4.4 <br /> 4.4.2 Groundwater Sampling................................................................................4.4 <br /> 4.4.3 Sample Handling and Analysis....................................................................4.5 <br /> 4.4.4 Borehole Abandonment...............................................................................4.5 <br /> 4.4.5 Decontamination .........................................................................................4.5 <br /> 4.4.6 Management of Investigation Derived Waste ..............................................4.5 <br /> 4.4.7 Quality Assurance/Quality Control Samples................................................4.5 <br /> 5.0 REPORTING AND SCHEDULING...............................................................................5.1 <br /> 6.0 REFERENCES.............................................................................................................6.1 <br />