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1 <br /> TABLE OF CONTENTS <br /> 1. INTRODUCTION.....................................................................................................................1 <br /> 1 1.1 Site Description ............................................................................................................1 <br /> 1.2 Regional Hydrogeology................................................................................................2 <br /> ' 1.3 Previous Environmental Investigations........................................................................3 <br /> 1.3.1 Initial Soil and Groundwater Investigations.....................................................3 <br /> 1.3.2 Health Risk Screening Evaluation....................................................................3 <br /> 1.3.3 Soil Sampling Work Plan and Response to Comments....................................3 <br /> 2. EXPOSURE PATHWAYS AND MEDIA OF CONCERN .....................................................4 <br /> ' 3. CONSTITUENTS OF POTENTIAL CONCERN AND EXPOSURE <br /> CONCENTRATIONS............................................................................................................4 <br /> 3.1 On-Site Soil Impacts and Exposure Point Concentrations...........................................5 <br /> ' 3.2 On-Site Groundwater Impacts......................................................................................5 <br /> 4. TOXICITY VALUES................................................................................................................6 <br /> 5. EXPOSURE ASSESSMENT AND RISK CHARACTERIZATION.......................................6 <br /> 5.1 Residential Cancer Risks..............................................................................................7 <br /> ' 5.2 Residential Non-Cancer Health Hazards......................................................................8 <br /> 5.3 Construction Worker Scenario .....................................................................................9 <br /> 5.4 Air Concentrations of Non-Volatile Organic Compounds and Volatile <br /> Organic Compounds from Soils...................................................................................9 <br /> 5.4.1 Air Concentrations of Non-Volatile Organic Compounds from <br /> Soil....................................................................................................................9 <br /> ' 5.4.2 Air Concentrations of Volatile Organic Compounds from Soil.....................10 <br /> 6. SUMMARY AND CONCLUSIONS......................................................................................11 <br /> 6.1 Residential Scenario...................................................................................................1 I <br /> 6.1.1 Cancer Risks from Soils...................... .................11 <br /> 6.1.2 Non-Cancer Health Hazards from Soils.........................................................12 <br /> I 6.2 Construction worker scenario.....................................................................................12 <br /> 6.2.1 Cancer Risks from Soils.................................................................................12 <br /> 6.2.2 Non-cancer Health Hazards from Soils..........................................................12 <br /> 7. UNCERTAINTIES..................................................................................................................13 <br /> 8. ECOLOGICAL SCREENING EVALUATION .....................................................................13 <br /> ' 9. RECOMMENDATIONS.........................................................................................................14 <br /> 10. REFERENCES ........................................................................................................................14 <br /> f�; <br /> ' From Science to Solutions <br />