The Technical Support Document for the Hazardous Waste Delisting Risk Assessment Software (DRAS)

The Delisting Technical Support Document presents extensive information delineating all chemical release, exposure and risk assessment algorithms employed by the DRAS program.

The document consists of six chapters -- Introduction, Estimation of Chemical Releases and Media Concentrations, Exposure Scenario Selection,Risk and Hazard Assessment, Uncertainty and References -- and an two appendices, which are listed as --A-1, A-2, A-3, A-4, A-5, and B.

• Table of Contents, and Chapter 1- Introduction (pdf) (481.27 KB)
• Chapter 2 – Estimation of Chemical Releases and Media Concentrations (pdf) (1.39 MB)
• Chapter 3 – Exposure Scenario Selection (pdf) (161.92 KB)
• Chapter 4 – Risk and Hazard Assessment (pdf) (2.29 MB)
• Chapter 5 – Uncertainty (pdf) (92.83 KB)
• Chapter 6 – References (pdf) (100.38 KB)
• Appendix A-1 – Chemical Data for Waste Constituents in DRAS Program (pdf) (4.57 MB)
• Appendix A-2 – National Primary Drinking Water Standards (pdf) (61.9 KB)
• Appendix A-3 – Soil Saturation Concentrations and Physical States at Ambient Temperature of Chemicals Considered for Delisting (pdf) (86.78 KB)
• Appendix A-4 – Target Organs and Critical Effects for Compounds with Reference Dose Values (pdf) (172.09 KB)
• Appendix A-5 – Default Variables: Abbreviations, Units, and Values (pdf) (94.15 KB)
• Appendix B – Parameters Used for Surface Pathway Release and Risk Calculations (pdf) (675.66 KB)