Fish populations are making a comeback in the streams surrounding the former tar ponds and coke ovens sites in Sydney, N.S., indicating positive progress following the extensive cleanup of decades of industrial activity in Cape Breton. The $400 million remediation project was carried out by the Sydney Tar Ponds Agency, later integrated into Nova Scotia Lands and now overseen by Build Nova Scotia, responsible for monitoring water quality in the streams traversing the former industrial zones. Donnie Burke, a senior director with the agency, highlighted that an independent engineering firm’s findings confirm the effectiveness of the remediation efforts, with ongoing improvements observed during recent assessments.
The coke ovens area, previously covered with slag rock remnants from the steel plant, and the infamous tar ponds, once deemed Canada’s most hazardous waste location, were both addressed through encapsulation and landscaping. Additionally, the cleanup extended to Coke Ovens Brook, Wash Brook, and Muggah Creek, with landscaping modifications guiding surface water flow into the streams and groundwater from the coke ovens area treated before re-entering the ecosystem. The sites were subsequently capped with topsoil and grass, transforming the former tar ponds into Open Hearth Park, featuring recreational facilities and green space, while the coke ovens site serves as open space for various activities.
Water quality assessments have shown no toxin release from the tar ponds cap, although occasional spikes in heavy metals or industrial chemicals are noted at the former coke ovens site, particularly after heavy rainfall. These anomalies are promptly identified by the monitoring system, adjusting the water treatment process accordingly. Ongoing monitoring, encompassing regular water testing and site inspections, remains vital in ensuring the long-term sustainability of the remediated areas.
Recent studies conducted by Cape Breton University have revealed the return of small fish species to the streams, with provincial staff observing trout eggs and fry in Coke Ovens Brook, showcasing a remarkable ecological recovery. Dr. Katherine Jones, a biologist at CBU, reported improved health conditions among mummichog fish inhabiting the tar ponds post-cleanup, noting the disappearance of previously documented health issues. Dr. Jones emphasized the importance of continued research to ascertain the impact of the remediation on local fish populations and explore their genetic connections.
Burke reiterated the government’s commitment to ongoing monitoring efforts for 25 years post-remediation, with regular updates on the progress available on Build Nova Scotia’s website. Midway through the monitoring period, the trends indicate positive developments, affirming the success of the cleanup initiatives.
