Fish populations are rebounding in the streams near the former tar ponds and coke ovens sites in Sydney, Nova Scotia, signaling a positive outcome following the extensive cleanup of decades of industrial pollution in Cape Breton.
The $400 million remediation project was overseen by the Sydney Tar Ponds Agency, which later merged into Nova Scotia Lands and now falls under Build Nova Scotia’s purview, responsible for monitoring water quality in the streams flowing through the former industrial areas.
According to Donnie Burke, a senior director at the agency, data from an independent engineering firm indicates that the remediation efforts are proving effective, with ongoing improvements or stable conditions observed. The coke ovens area, previously covered with slag rock from the steel plant, was restored, while the tar ponds, once dubbed Canada’s most contaminated waste site, were capped with concrete.
Coke Ovens Brook, Wash Brook, and Muggah Creek were all cleaned up, and the surrounding areas were landscaped to channel surface water into the streams, with groundwater from the coke ovens directed to a treatment facility before rejoining the waterways. The sites were subsequently capped with topsoil and grass.
The former tar ponds have been transformed into Open Hearth Park, offering recreational amenities like sports fields, playgrounds, and walking paths. In contrast, the coke ovens site has become an open field utilized for various activities such as cricket, walking, and snowmobiling.
Water quality assessments confirm that the tar ponds cap is effectively containing pollutants, while occasional spikes in heavy metals or industrial chemicals from the coke ovens site following heavy rainfall are promptly addressed through the monitoring system and adjusted water treatment processes, ensuring environmental safety.
Ongoing water testing in the streams and beneath the former coke ovens cap through strategically placed wells has revealed encouraging signs of aquatic life returning, with provincial staff recently observing trout eggs and fry in Coke Ovens Brook, a marked improvement since the cleanup efforts began.
Dr. Katherine Jones, a biologist at Cape Breton University, noted an enhancement in the health of mummichog fish residing in the former tar ponds post-cleanup, showing significant improvements in physical abnormalities previously observed. Further studies are planned to ascertain the long-term impact on local fish populations and their genetic ties to pre-cleanup inhabitants.
Government commitment to monitoring the sites for 25 years post-cleanup is ongoing, with regular updates on Build Nova Scotia’s website. Positive trends in environmental health and aquatic life recovery affirm the success of the remediation efforts thus far.