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Additional Site Assessment Report and Human Health Risk Screening Evaluation <br />www.arcadis.com <br /> <br />Contents <br />Acronyms and Abbreviations............................................................................................................................ ii <br />1 Introduction ................................................................................................................................................ 1 <br />2 Background ................................................................................................................................................ 1 <br />2.1 Site Location and Description............................................................................................................ 2 <br />2.2 Site History ......................................................................................................................................... 2 <br />2.3 Geology and Hydrogeology ............................................................................................................... 2 <br />3 Site Assessment Activities ........................................................................................................................ 3 <br />3.1 Pre-Field Activities ............................................................................................................................. 3 <br />3.1.1 Health and Safety Plan Preparation ............................................................................................... 3 <br />3.1.2 Permitting........................................................................................................................................ 3 <br />3.1.3 Underground Utility Locating ......................................................................................................... 3 <br />3.2 Field Activities .................................................................................................................................... 3 <br />3.2.1 Scope of Work ................................................................................................................................ 3 <br />3.2.2 Soil Assessment ............................................................................................................................. 4 <br />3.2.3 Soil Vapor Assessment .................................................................................................................. 5 <br />3.2.4 Equipment Decontamination Procedures...................................................................................... 6 <br />3.2.5 Investigation -Derived Waste .......................................................................................................... 6 <br />4 Quality Assurance/Quality Control ............................................................................................................ 7 <br />5 Analytical Results ...................................................................................................................................... 7 <br />5.1 Soil Analytical Results ....................................................................................................................... 7 <br />5.2 Soil Vapor Analytical Results............................................................................................................. 8 <br />5.2.1 Total Petroleum Hydrocarbons and Volatile Organic Compounds .............................................. 8 <br />5.2.2 Fixed Gases .................................................................................................................................... 8 <br />5.3 Quality Assurance/Quality Control Sample Analytical Results ........................................................ 9 <br />6 Human Health Risk Screening Evaluation ................................................................................................ 9 <br />6.1 2009 Science Applications International Corporation Human Health Risk Screening Evaluation <br />Summary ........................................................................................................................................................ 9 <br />6.2 2012 Science Applications International Corporation Human Health Risk Screening Evaluation <br />Summary ........................................................................................................................................................ 9 <br />6.3 2019 Leidos Human Health Risk Screening Evaluation Summary ................................................. 10 <br />6.4 2022 Arcadis Human Health Risk Screening Evaluation ................................................................ 10 <br />7 Summary and Recommendations ........................................................................................................... 11