Appendix C - Passaic River Public Digital Library

TABLE OF CONTENTS
1.0 INTRODUCTION..........................................................................................................................1-1
2.0 COMPILATION OF AVAILABLE DATA.................................................................................2-1
3.0 IDENTIFICATION OF CONTAMINANTS OF POTENTIAL CONCERN (COPC)............3-1
4.0 HUMAN HEALTH AND ECOLOGICAL CONCEPTUAL SITE MODELS.........................4-1
4.1 Environmental Setting............................................................................................................4-1
4.2 Exposure Assessment .............................................................................................................4-3
4.2.1 Human Exposures ..................................................................................................4-3
4.2.2 Ecological Exposure ..............................................................................................4-5
4.2.3 EPC Development for Comparative Risk Assessment ..........................................4-6
5.0 HUMAN HEALTH RISK ASSESSMENT – CURRENT CONDITIONS................................5-1
5.1 Exposure Assessment .............................................................................................................5-1
5.1.1 Exposure Pathways ................................................................................................5-1
5.1.2 Exposure Media .....................................................................................................5-1
5.1.3 Potential Receptors and Exposure Routes..............................................................5-6
5.1.4 Estimation of Chemical Intake...............................................................................5-7
5.2 Toxicity Assessment.............................................................................................................5-20
5.3 Risk Characterization ...........................................................................................................5-22
5.3.1 RME Results ........................................................................................................5-24
5.3.2 CTE Results .........................................................................................................5-25
5.4 Human Health Uncertainty Analysis....................................................................................5-26
6.0 ECOLOGICAL RISK ASSESSMENT – CURRENT CONDITIONS......................................6-1
6.1 Exposure Assessment .............................................................................................................6-1
6.1.1 EPCs.......................................................................................................................6-1
6.1.2 Dose Model............................................................................................................6-1
6.1.3 Avian Egg Residue Analysis..................................................................................6-2
6.2 Toxicity Assessment...............................................................................................................6-3
6.3 Risk Characterization ...........................................................................................................6-17
6.3.1 Benthic Invertebrate Risk Estimates ....................................................................6-17
6.3.2 Fish Risk Estimates..............................................................................................6-20
6.3.3 Wildlife Risk Estimates .......................................................................................6-20
6.3.4 Summary of Current Risks...................................................................................6-24
6.4 Ecological Uncertainty Analysis ..........................................................................................6-25
7.0 DEVELOPMENT OF EPCS FOR FUTURE CONDITIONS ...................................................7-1
7.1 Summary of Mass Balance Approach ....................................................................................7-1
7.2 Calculations of Future EPCs ..................................................................................................7-1
7.3 Uncertainties Related to Development of Future EPCs .........................................................7-3
8.0 REMEDIAL ALTERNATIVES FUTURE RISK ASSESSMENT............................................8-1
8.1 Comparison of Human Health Risk Reduction by Remediation Scenario.............................8-1
8.1.1 Monitored Natural Recovery..................................................................................8-6
8.1.2 Primary Erosional Zone/Primary Inventory Zone..................................................8-7
8.1.3 Area of Focus.........................................................................................................8-8
8.1.4 Alternative Risk Reduction Comparisons..............................................................8-9
8.2 Comparison of Ecological Risk Reduction by Remediation Scenario .................................8-11
8.2.1 Monitored Natural Recovery................................................................................8-13
8.2.2 Primary Erosional Zone/Primary Inventory Zone................................................8-17
8.2.3 Area of Focus.......................................................................................................8-17
Draft Focused Feasibility Study Risk Assessment i June 2007
Lower Passaic River Restoration Project Appendix C