Appendix C - Passaic River Public Digital Library

1. Bioaccumulation screen (indirect toxicological effects to wildlife through the food chain);
2. Essential nutrient screen; and,
3. Effects value screen (direct toxicological effects to benthic invertebrates).
The screening process is described in detail in Attachment 2. Ten COPECs (see Table 3-1) were
identified as comprising the largest contribution of total potential risk and were carried through this
assessment. These compounds had hazard quotients (HQ) that exceeded 100 for inorganic compounds
and greater than 1,000 for organic compounds. Ecological COPECs identified for this assessment include
the following:
• Dioxins/furans (D/F) (as TCDD TEQ);
• PCB congeners (12 dioxin-like congeners as TCDD TEQ);
• Total PCB (sum Aroclors);
• Total DDx (sum of DDE, DDD, and DDT isomers);
• Dieldrin;
• Low molecular weight PAHs (LPAH);
• High molecular weight PAHs (HPAH);
• Copper;
• Lead; and,
• Mercury (including methyl mercury).
As done in the human health assessment, data for total mercury and methyl mercury were assumed to be
equivalent and treated as if all were methyl mercury.
Draft Focused Feasibility Study Risk Assessment 3-3 June 2007
Lower Passaic River Restoration Project Appendix C