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• 8.2.1 Identification of Chemicals of Potential Concern........................................................................21 8.2.2 Exposure Assessment Methods....................................................................................................21 8.2.3 Risk Assessment Methods............................................................................................................22 8.2.4 General Hazard Assessment Results............................................................................................23 8.2.5 Lead..............................................................................................................................................24 9.0 SUMMARY........................................................................................................................................25 10.0 CONCLUSIONS AND RECOMMENDATIONS ..................................................................:.......26 11.0 LIMITATIONS..................................................................................................................................27 12.0 QUALIFICATIONS AND SIGNATURES.....................................................................................29 REFERENCES APPENDICES APPENDIX A Figure 1 Vicinity Map Figure 2 Site Map Figure 3 Lawn Area Sample Locations,August 6, 2003 Figure 4 Structure Dripline Sample Locations, August 7-12, 2003 Figure 5 Soil Gas and Groundwater Sample Locations, August 11-15, 2003 Figure 6 Natural Gas Field Soil Gas Sample Locations, August 11-14, 2003 Figure 7 PCB Sample Locations,August 11-12, 2003 • Figure 8 Lawn Area Sample Locations with Dieldrin and Heptachlor Epoxide Concentrations Figure 9 Lawn Area Sample Locations with Hexavalent.Chromium Results Figure 10 Lawn Area Sample Locations with Cobalt Concentrations Figure 11 Structure Dripline Sample Locations with Lead Concentrations Figure 12 Soil Gas and Groundwater Sample Locations with Selected Soil Gas Results Figure 13 Groundwater Sample Locations with Selected Groundwater Results Figure 14 Sample Locations with Potential Health Concern APPENDIX B Laboratory Data and Chain-of-Custody Forms APPENDIX C Table A—Statistics of Metals Data and COPC Determination PEA Risk and Hazard Calculations Johnson and Ettinger Model Risk and Hazard Calculations Leadspread 7 Model Spreadsheet Screening Evaluation Equations Wilcoxon Rank Sum Calculations Particle Size Distribution Report Nk--W• �.1� CONDOR