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5.4.2 Toxicity Assessment................................................... ........................................66 <br /> 5.4.2.1 Carcinogenic Health Effects........................ ........................................66 <br /> 5.4.2.2 Non-carcinogenic Health Effects................. ........................................67 <br /> 5.4.2.3 Compiled Toxicity Values........................... ........................................68 <br /> 5.4.2.4 Uncertainties................................................ ........................................68 <br /> 5.4.3 Exposure Assessment.................................................. ........................................68 <br /> 5.4.3.1 Conceptual Site Model................................ ........................................69 <br /> 5.5.3.2 Routes of Exposure..................................... ........................................70 <br /> 5.4.3.3 Land Use Exposure Scenario...................... .........................................70 <br /> 5.4.3.4 Receptors.................................................... ........................................71 <br /> 5.4.3.5 Uncertainties............................................... .........................................72 <br /> 5.4.4 Risk Characterization................................................. .........................................72 <br /> 5.4.4.1 Carcinogenic Risk Assessment................... .........................................72 <br /> 5.4.4.2 Non-carcinogenic Hazard Assessment....... .........................................73 <br /> 5.4.4.3 Uncertainties............................................... .........................................73 <br /> 5.4.5 Uncertainty Assessment............................................. .........................................74 <br /> 5.4.5.1 Hazard Identification.................................. .........................................74 <br /> 5.4.5.2 Toxicity Assessment................................... .........................................75 <br /> 5.4.5.3 Exposure Assessment................................. .........................................75 <br /> 5.4.5.4 Risk Characterization.................................. .........................................75 <br /> 5.5 EVALUATION OF AREAS OF CONCERN......................... .........................................77 <br /> 5.5.1 Pentachlorophenol Areas........................................... .........................................77 <br /> 5.5.1.1 History of AOC........................................... .........................................77 <br /> 5.5.1.2 Land Use and Materials Usage................... .........................................77 <br /> 5.5.1.3 Site Setting/Surroundings........................... .........................................77 <br /> 5.5.1.4 Conceptual Site Model................................ .........................................78 <br /> 5.5.1.5 Environmental Investigation....................... .........................................78 <br /> 5.5.1.6 Risk Assessment......................................... .........................................79 <br /> 5.5.1.7 Risk Management Recommendations......... .........................................79 <br /> 5.5.2 Underground Storage Tanks ...................................... .........................................79 <br /> 5.5.2.1 Risk Management Recommendations......... .........................................80 <br /> 5.5.3 Teepee Burner............................................................ .........................................80 <br /> 5.5.3.1 History of AOC........................................... .........................................80 <br /> 5.5.3.2 Land Use and Materials Usage.................. .........................................80 <br /> 5.5.3.3 Site Setting/Surroundings.......................... .........................................80 <br /> 5.5.3.4 Conceptual Site Model............................... .........................................80 <br /> 5.5.3.5 Environmental Investigation...................... ..........................................81 <br /> 5.5.3.6 Risk Assessment........................................ ..........................................81 <br /> 5.5.3.7 Risk Management Recommendations........ ..........................................83 <br /> 5.5.4 Bum Pits.................................................................... ..........................................83 <br /> 5.5.4.1 History of AOC.......................................... ..........................................84 <br /> 5.5.4.2 Land Use and Materials Usage.................. ..........................................84 <br /> 5.5.4.3 Site Setting/Surroundings.......................... ..........................................84 <br /> 5.5.4.4 Conceptual Site Model............................... ..........................................85 <br /> 5.5.4.5 Environmental Investigation...................... ..........................................85 <br /> 5.5.4.6 Risk Assessment........................................ ..........................................85 <br /> 5.5.4.7 Management Recommendations................ ..........................................87 <br /> 5.5.5 Steam Cleaning and Western Ditch Areas................ ..........................................88 <br /> 5.5.5.1 History of AOC.......................................... ..........................................88 <br /> 5.5.5.2 Land Use and Materials Usage.................. ..........................................88 <br /> 5.5.5.3 Site Setting/Surroundings.......................... ..........................................88 <br /> Drefti� <br /> KB61125workplm-ESC MACTEC Engineering and Cons Iting, Inc. iv <br /> September 28,2005 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