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4 <br /> Stockton 99 Speedway <br /> Preliminary Endangerment Assessment Workplan April 12,2007 <br /> TABLE OF CONTENTS <br /> PAGE <br /> LISTOF FIGURES........ ..................... ............................................................................................. <br /> LIST OF TABLES..................... ... .iii <br /> E LIST OF APPENDICES...........................................................................................................................iii <br /> 1.0 INTRODUCTION.......................................................................................................... .1-1 <br /> 1.1 Introduction...................................:..................................... 1-1 <br /> 1.2 PEA Workplan Objectives...............................................................................................1-1 <br /> 1.3 - Organization of the Workplan .........................................................................................1-1 <br /> 2.0 PROJECT SCOPING..................................................................................................................2-1 <br /> 2.1 Project Goals ........2-1 <br /> .......................................................................................................... <br /> 2.2 Geographic Setting...............................................................................................:.........2-1 <br /> 2.3 H dro eolo ical Setting .....................2-1 <br /> 2.4 . Climate....................................... .2-2 <br /> ..............................................................................:.... <br /> 2.5 Site Operations...................................................:...........................................................2-2 <br /> 2.6 Existing Site Data.............:........................... .................................................................2-2 <br />'I 3.0 PRELIMINARY CONCEPTUAL SITE MODEL........................................::................................3-1 <br /> 3.1.1 Initial Characterization of Potential Source Areas...................................:.................3A <br /> 3.1.2 Chemical Release Mechanisms and Identification of Transport Media.....................3-2 <br /> 3.1.3 Potentially Exposed Receptors..................................................................................3-3 <br /> 3.1.4 Exposure Pathways Considered Potentially Complete and Significant.....................3-4 <br /> 3.1.5 Summary of Data Needs...........................................................................................3-5 <br /> 3.2 Human Health and Ecological Screening Evaluation...........................:..........................3-6 <br /> I <br />` 4.0 FIELD SAMPLING PLAN ,,,4-1 <br /> ....................................................:.................................................. <br /> 4.1 Sampling Objectives.......................................................................................................4-1 <br /> 4.1.1 General................................................:....................................................................4-1 <br /> 4.1.2 Data Gap Identification.............................................................................................4-1 <br /> 4.1.3 Soil Samples.....................................................................:........................................4-1 <br /> 4.2 Sample Designations- 4-3 <br /> ....................................................................... <br /> 4.3 Sampling Equipment ....4-4 <br /> .................................................................................................... <br /> 4.4 Decontamination Procedures .......................................:.....:...........................................4-4 <br /> 4.5 Sample Handling............................................................................................................4-5 <br /> 4.5.1 Sample Numbering System and Label.....................................................................4-5 <br /> 4.5.2 Bottles and Preservatives.......................... <br /> ................ <br /> ............................. <br /> ...................4-5 <br /> 4.5.3 Sample Chain-of-Custody Records..........................................................................4-5 <br /> 4.5.4 Photographs.............................................................................................................4-6 <br /> 4.5.5 Labeling, Packaging,and Shipment <br /> 4.6 Sample Analysis.......................... ........................4-6 <br /> 4.7 Investigation-Derived Waste Management Plan...............................................................4-7 <br /> PEAWbft1an.FinW.&ni The Source Group,Inc, <br />