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FABLE OF CONTENTS <br /> Section9 Introduction... ...................................................................................................................1.1 <br /> 1 1 Regulatory Framework 1-1 <br /> 12 Objectives 1-4 <br /> 13 Scope 1-4 <br /> 14 Report Organization 1-5 <br /> Section2 Site Background................................................................................. .............................2.1 <br /> 21 Site Description and Historical Use 2-1 <br /> 22 Geology and Hydrogeology 2-1 <br /> 2 2 1 Soils 2-1 <br /> 2 2 2 Regional Hydrogeology 2-2 <br /> 2 2 3 Local Geology/Hydrogeology 2-3 <br /> 23 Climate 2-3 <br /> 24 Land Use 24 <br /> 25 Previous Site Investigations 2-4 <br />' Section 3 Data Analysis.......................................................................................................................3.1 <br /> 3 1 Data Review 3-1 <br /> 3 1 1 Soil Samples 3-1 <br /> 3 12 Comparison of Soil Data With EPA Region IX Preliminary <br /> Remediation Goals 3-2 <br />' 3 13 Groundwater Data 3-3 <br /> Section 4 Exposure Assessment......................... . ................................ ........................................4.1 <br /> 41 Potential Receptor Populations 4-1 <br /> 42 Conceptual Site Model 4-2 <br /> 1 4 2 1 Exposure Pathways 4-3 <br /> 4 2 2 Chemical Release Mechanisms and Transport Media 4-3 <br /> 4 2 3 Exposure Points 44 <br /> 4 2 4 Human Receptors 4-4 <br /> 43 Complete Exposure Pathways 44 <br /> 44 Estimating Chemical Intakes 4-5 <br /> 4 4 1 Quantifying Reasonable Maximum Exposures (RME) 4-5 <br /> 4 4 2 Exposure Point Concentrations 4-6 <br /> 4 4 3 Calculation of Intake Factors 4-11 <br /> 45 Exposure Assumptions 4-14 <br /> 4 5 1 Exposure Frequency, Duration, Body Weight 4-14 <br /> 4 5 2 Assumptions for Inhalation of Volatiles, Groundwater <br /> Ingestion, Dermal Exposure, and Soil Ingestion 4-15 <br /> Section5 Toxicity Assessment...........................................................................................................5.1 <br /> ® T116B7W73008NA15TOCKTON%REPORTISHOREP#1 U0G1&FE84Va73008NA%SNA 1 <br />