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Niagara River Remedial Action Plan Stage 2 Update Report

Niagara River Remedial Action Plan Stage 2 Update Report

6. Temporal trends in

6. Temporal trends in contaminant levels (PCBs and dioxinlike PCBs), examined through the use of sentinel species, (i.e., Herring Gull, night-heron, snapping turtle eggs, and/or livers of mink), are stable or declining. Spatial comparisons show that contaminant concentrations in the eggs of the above species in areas under the influence of the Niagara River (Ontario) AOC are equal to or less than those from sites. removed from any influence of the AOC. If the whole body burden concentrations do exceed this level then they must not result in a population level affect to the bird and/or wildlife populations. 7. OR if a contaminated site (as designated by the Niagara River Contaminated Sediment Technical Advisory Group*) fails to meet the criteria described above in regard to fish and wildlife body burdens, then a risk based Contaminated Sediment Management Strategy must be in place with appropriate monitoring and mitigation measures and/or administrative controls. (Note: A delisting criteria will be developed if this BUI is shown to be Impaired) 8. When the types and frequency of deformities and/or reproduction impairments associated with contaminant exposure (PCBs and dioxin-like PCBs) are similar to those in a suitable non-AOC reference site or sites, examined through the use of sentinel species (i.e., snapping turtles, herring gulls). If the types and frequency of deformities and/ or reproductive impairments exceed this target then they must not result in a population level affect to the bird and/or animal populations. 9. When acute and chronic toxicity, community composition and abundance in the benthic community are similar to non- AOC reference sites. 10. When benthic invertebrate tissue contaminant (PCBs and dioxin-like PCBs) concentrations are comparable in the AOC to those at suitable non-AOC reference sites for contaminants that biomagnifies in the aquatic food chain and/or in cases where benthic invertebrate tissue contaminant concentrations are greater than reference sites but are below concentrations considered to impair the beneficial uses associated with the consumption of fish and wildlife. 11. OR if a contaminated site (as designated by the Niagara River Contaminated Sediment Technical Advisory Group*) fails to meet the criteria described above in regard to degradation of benthos, then a Contaminated Sediment Management Strategy must be in place including a risk management approach with appropriate monitoring and mitigation measures and/or administrative controls. (Note: Changed to Not Impaired as per the decision on May 4, 1998 by Canada-Ontario Agreement RAP Steering Committee.) 4) Fish Tumours and Other Deformities 5) Bird or Animal Deformities or Reproduction Problems 6) Degradation of Benthos Typically broken into two sections when assessed: }} Dynamics of Benthic Populations }} Body Burdens of Benthic Populations 7) Restrictions on Dredging Activities Not Impaired Not Impaired Impaired Not Impaired X X X 48

Niagara river remedial action plan stage 2 update 8) Eutrophication or Undesirable Algae 9) Restrictions on Drinking Water Consumption or Taste and Odour Problems 10) Beach Closings 11) Degradation of Aesthetics 12) Added Costs to Agriculture or Industry 13) Degradation of Phytoplankton and Zooplankton Populations 14) Loss of Fish and Wildlife Habitat (Note: Delisting criteria will be developed and directed by the results of the Eutrophication Study) 12. Public beaches meet the following conditions: i) Prominent sources of fecal pollution that could contaminate beach or recreational waters are known; ii) Less than 20% of the geometric means of water samples collected over the swimming season exceed the Provincial Water Quality Objectives (100 E. coli /100ml), or is similar to a suitable non-AOC reference site, when assessed over a period of at least three to five years; iii) Any severe exceedance of Provincial Water Quality Objectives is rare and predictably associated with local events such as significant rainfall events. (Note: Delisting criteria will be developed if this BUI is shown to be Impaired) 13. The percentage by area of wetland cover within the AOC and the percentage by stream length of riparian buffers within the AOC are not significantly different as compared to suitable non-AOC reference sites. 14. 75% of the potential barriers to fish movement (as identified through the Niagara River AOC Fish Barriers Project 2001 – Phase 1 Photo Library) must be removed or remediated restoring access to potential spawning habitat. 15. The percentage of woodland and wetland habitat by area in the AOC, and the percentage of stream length with (at least) a 30m vegetated buffer in the AOC is not significantly different when compared to suitable non-AOC reference sites. Impaired Not Impaired Impaired Not Impaired Not Impaired RFA Impaired 49

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