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0 Table of Contents Listof Fiqures....................................................................................................... Listof Tables..................................................................................................................................................ii Acronyms and Abbreviations "' ExecutiveSummary ................................................................................................................................. ES -1 1.0 Introduction.....................................................................................................................................1-1 1.1 Site Location.........................................................................................................................1-1 1.2 Document Organization........................................................................................................1-1 2.0 Site Description...............................................................................................................................2-1 2.1 Site Use................................................................................................................................2-1 2.2 Geology and Hydrogeology..................................................................................................2-1 2.2.1 Geology...................................................................................................................2-1 2.2.2 Hydrogeology.......................................................................................................... 2-2 2.3 Investigation History .............................................................................................................2-3 2.4 Nature and Extent of Petroleum Hydrocarbon Contamination .............................................. 2-4 3.0 Treatment Objective........................................................................................................................ 3-1 4.0 Identification and Evaluation of Treatment Alternatives..................................................................4-1 4.1 Groundwater Pump and Treat..............................................................................................4-2 4.1.1 Technical Effectiveness...........................................................................................4-2 4.1.2 Implementability......................................................................................................4-3 4.1.3 Cost.........................................................................................................................4-3 4.2 Air Sparging with SVE.......................................................................................................... 4-4 4.2.1 Technical Effectiveness...........................................................................................4-4 4.2.2 Implementability......................................................................................................4-5 4.2.3 Cost.........................................................................................................................4-5 4.3 Biosparging..........................................................................................................................4-5 4.3.1 Technical Effectiveness...........................................................................................4-6 4.3.2 Implementability......................................................................................................4-6 4.3.3 Cost.........................................................................................................................4-7 4.4 In -Situ Chemical Oxidation................................................................................................... 4-7 4.4.1 Technical Effectiveness...........................................................................................4-8 4.4.2 Implementability......................................................................................................4-8 4.4.3 Cost.........................................................................................................................4-8 5.0 Comparison and Selection of Treatment Alternatives..................................................................... 5-1 6.0 Conclusions and Recommendations............................................................................................... 6-1 7.0 References..................................................................................................................................... 7-1 FS Onsite Petroleum Hydrocarbon Remediation.doc i Shaw Environmental, Inc.