Fish populations are rebounding in the streams near the former tar ponds and coke ovens sites in Sydney, N.S., indicating a positive outcome following the extensive cleanup of decades of steel and coal industry activities in Cape Breton.
The $400 million remediation project was overseen by the Sydney Tar Ponds Agency, later integrated into Nova Scotia Lands and now under Build Nova Scotia. This agency is responsible for monitoring water quality in the streams that flow through the former industrial zones.
Donnie Burke, a senior director at the agency, highlighted that findings from an independent engineering firm demonstrate the effectiveness of the remediation efforts. He expressed satisfaction with the progress, stating, “Everything we have observed so far indicates stability or improvement, which is excellent news.”
The remediation process involved covering the coke ovens ground with residual slag rock from the former steel plant and encapsulating the infamous tar ponds, once deemed Canada’s most hazardous waste site, in cement. Additionally, Coke Ovens Brook, Wash Brook, and Muggah Creek underwent cleanup, with the surrounding areas landscaped to channel surface water into the streams. Groundwater from the coke ovens area is directed to a treatment facility before being reintroduced into the streams.
Both sites were then covered with topsoil and grass, transforming them into Open Hearth Park (formerly the tar ponds) and an open field used for recreational activities like cricket, walking, and snowmobiling (former coke ovens).
Water testing has confirmed that the tar ponds cap is effectively containing toxins, while occasional spikes in heavy metals or industrial chemicals from the coke ovens site, particularly after heavy rainfall, are promptly addressed through the monitoring system and water treatment adjustments.
Burke emphasized the ongoing commitment to monitoring the sites for 25 years post-cleanup, with regular updates on Build Nova Scotia’s website. Results indicate positive trends halfway through the monitoring period, with continuous improvements observed.
Recent studies by Cape Breton University have documented the return of fish species to the streams, including the presence of trout eggs and fry in Coke Ovens Brook. This resurgence of aquatic life signifies a remarkable transformation of the environment.
Dr. Katherine Jones, a CBU biologist, noted improvements in the health of mummichogs residing in the former tar ponds following the cleanup. Monitoring will continue to assess the impact on local fish populations and their genetic connection to the previous inhabitants of the area.
The successful rehabilitation of these industrial sites underscores the progress made in environmental restoration efforts, with a focus on ensuring the sustained health of aquatic ecosystems for future generations.