user's guide and background technical document for the nevada ...

TABLE OF CONTENTS
DISCLAIMER ............................................................................................................................................. iii
1.0 BACKGROUND ON NDEP BASIC COMPARISON LEVELS (BCLs) ........................................ 1
1.1 Conceptual Site Model ................................................................................................................. 2
1.2 Application of the Basic Comparison Levels Table ..................................................................... 3
1.3 Potential Issues and Misapplication of BCLs ............................................................................... 4
2.0 NDEP BASIC COMPARISON LEVELS (BCLs) ........................................................................... 4
2.1 Toxicity Values ............................................................................................................................. 5
2.2 Soil-to-Air Volatilization Factors (VFs) ....................................................................................... 6
2.3 Volatilization Factor for Residential Water .................................................................................. 7
2.4 Soil Saturation Limits ................................................................................................................... 7
2.5 Particulate Emission Factor for Soils ........................................................................................... 8
2.6 Dermal Absorption Factors........................................................................................................... 8
2.7 Age-Adjustment Factors ............................................................................................................... 9
3.0 HUMAN HEALTH-BASED BCLs ................................................................................................ 10
3.1 Equations for Residential Land Use Scenario (Soil) .................................................................. 10
3.2 Equations for the Indoor Commercial/Industrial Worker Scenario (Soil) .................................. 13
3.3 Equations for the Outdoor Commercial/Industrial Worker Scenario (Soil) ............................... 15
3.4 Equations for Ambient Air ......................................................................................................... 18
3.5 Equations for Residential Tap Water .......................................................................................... 19
3.6 Development of Final Human Health Soil BCLs ....................................................................... 20
3.7 Screening with Multiple Contaminants ...................................................................................... 21
3.8 BCLs for Chemicals with Special Considerations ...................................................................... 22
4.0 LEACHING-BASED BCLS (LBCLS) ........................................................................................... 27
5.0 BCLS FOR RADIONUCLIDES .................................................................................................... 30
6.0 REFERENCES ............................................................................................................................... 31
Appendix A: Annotation of Updates to the BCL Table
Appendix B: Documentation for Toxicological Surrogates
Appendix C: Documentation for “Other” Toxicity Values
Appendix D: Calculation Spreadsheet for LBCLs
Appendix E: Radionuclide BCL Guidance
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