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Niagara River Remedial Action Plan Stage 2 Update Report

Niagara River Remedial Action Plan Stage 2 Update Report

Table 8:

Table 8: Niagara AOC Contaminated Sediment Areas – Status and Recommended Action Name of Area Level One Sites Welland River at Atlas Steel Lyons Creek West Lyons Creek East Welland River - Port Robinson to Power Canal Potential Chemicals of Concern Metals (Cr, Cu, Ni) PAHs PCBs, Arsenic, Zinc PCBs Metals (Cr, Cu, Ni) PAHs, PCBs Outcome of Detailed Assessment Recommended Action Remediation warranted. Remediated (dredged) in 1995. Marginal risk to human health and biota identified. Not physically part of the Welland/ Niagara system. Marginal risk to biota identified. No acute toxicity to biota observed. Localized growth impairment of some invertebrates possibly due to metal mixture of Cu, Cr and Ni. No changes at the population level expected. Management strategy under development. Arsenic contaminated sediment and soil removed by Hydro One in September 2007. Monitored natural recovery was the selected management option (2008). This strategy will include administrative controls and a long-term monitoring plan. Remedial efforts would have marginal benefit. Refer to AOC monitoring plan. Level Two Sites Sir Adam Beck Reservoir Metals Concentrations low, negligible risk to biota. No further action required. Thompson’s Creek Frenchman’s Creek Level Three Sites Welland River at Geon (Oxyvinyl) Black Creek Mouth Pell Creek Mouth Chippawa Creek Chippawa Power Canal Metals Metals, Dioxins/Furans Metals, Dioxins/Furans Metals (Arsenic) Metals, PAHs, PCBs Metals, PAHs, PCBs Metals, Dioxins/Furans Elevated levels (copper) downstream of Cytec site but no observed effects on test organism. No detectable risk to biota from PCDD/F and no transport of sediments from tributary to main creek. No acute toxicity to biota observed. Localized growth impairment of some invertebrates possibly due to metal mixture of Cu, Cr and Ni. No changes at the population level expected. No potential risks to biota. No potential risks to biota. Adverse effects or bioaccumulation unlikely. No potential risks to biota. No further action required. No further action required. Remedial efforts would have marginal benefit. Refer to AOC monitoring plan. No further action required. No further action required. No further action required. No further action required. Niagara River at Queenston Metals, Dioxins/Furans Organic contaminants present but evidence that the majority of sediments being carried out into Lake Ontario with minor amounts accumulating. Variety of possible sources precludes active remediation. Refer to NRTMP and ot her monitoringprograms. Niagara River at NOTL Metals, Dioxins/Furans Risks low, effects on biota unlikely due to dynamic behaviour of sediments at the mouth of the river. Further investigation or action not warranted. Refer to NRTMP and other monitoring programs. Note: References for the information listed above (Niagara AOC Contaminated Sediment Areas 50 – Status and Recommended Action 51 ) 50 Information compiled from Golder Associates Ltd. May 2004. Niagara River Area of Concern Contaminated Sediment Site Assessment Phase I and Phase II. 51 Golder Associates Ltd. February 2005. Niagara River Area of Concern Contaminated Sediment Site Assessment Phase III. 24

Niagara river remedial action plan stage 2 update Figure 7: Dredging deposits of mill-scale at the Welland River reef site in 1995 As mentioned above, priority areas for further assessment were identified and presented in the RAP Stage 1 Update report (1995). In 2003, a technical committee (the Niagara River Contaminated Sediment Technical Advisory Group) comprised of representatives from MOE, EC, NPCA, MNR and NR, was established and coordinated by the NPCA to evaluate contaminated sediment sites in the AOC 52 . From the results of the site assessments, four of the sites warranted further investigation. Results from further investigation indicated that Frenchman’s Creek required no further action and the Welland River from Port Robinson to Power Canal would benefit little from any additional remedial action. 53 Similarly, it was assessed that remedial efforts would have marginal benefit at the Geon (Oxy Vinyls) site. For descriptions and recommended actions for the assessed sites see Table 8 (previous page). The remaining two sites - Lyons Creek West and Lyons Creek East - are currently being addressed. Figure 8 shows the location of the Lyons Creek sites. Originally, Lyons Creek flowed from southeast Welland and emptied into the Niagara River. From the 1940s through the 1960s, sewers servicing the City of Welland drained into Lyons Creek. In 1971, the Welland Canal By-Pass severed Lyons Creek, creating 2 separate watersheds: Lyons Creek West, which empties into the Welland Canal By-Pass; and, Lyons Creek East, which receives water that is pumped directly from the Welland Canal By-Pass. 52 Golder Associates Ltd. May 2004. Niagara River Area of Concern Contaminated Sediment Site Assessment Phase I and Phase II. 53 Golder Associates Ltd. February 2005. Niagara River Area of Concern Contaminated Sediment Site Assessment Phase III. 25

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