Update #4: Odour near Bristol Avenue, Liverpool, Route #3 Highway to Brooklyn
July 12, 2019; Liverpool, NS: An odour is occurring at various times near Liverpool, Bristol Avenue, and Highway #3, Brooklyn. Region employees continue to proactively consult with experts to locate causes of the odour and pursue potential solutions. The Municipal Sewage Treatment facility located on Hank Snow Drive continues to meet all regulatory effluent requirements.
As local wetlands transitioned from winter/spring/summer conditions, it became more evident that the odour was increasing from the RQM facility, and decreasing from the wetlands, especially during the recent week of warm sunny weather. The prevailing wind direction generally dissipates odour, however certain wind direction and humidity levels can result in a noticeable odour in various areas of the community. It should be noted that the New Minas area also experienced a similar odour issue.
Proactive efforts over past weeks have included the flushing of our sewage lines from Milton, as well as on Bristol Avenue, to the sewage treatment plant. Skimming of the surface of the primary cell at the sewage treatment facility was completed to remove any fats or oils which may be present, which could potentially generate an odour.
The RQM Waste Water treatment facility and aerated lagoons were constructed in 2001 with a projected dredge cycle of from 25 to 30 years. It was determined through expert opinion that while dredging was premature at 18 years of operation, de-sludging should occur as soon as possible due to the existing odour issue. The future dredging cycle for the primary lagoon will be significantly extended after the de-sludging process is completed.
The contractor who performs this work was fully obligated with existing contracts, and there is limited availability for this specialized service. That contractor was graciously willing to endeavour to accommodate us as soon as possible due to RQM staff requests, to be able to de-sludge the primary lagoon through their odourless process. This company is expected to begin staging equipment next week at the lagoon site to prepare for the de-sludging operation. The primary lagoon presently emits a significant odour. The projected expenditure is $150,000, which was approved at the Regular Council meeting this week on July 9, 2019, with actual dredging being expected to take two weeks to complete.
Staff will continue to research and consult with experts in their areas of expertise, to receive feedback and potential recommendations toward further mitigation solutions. Activities will also continue to occur towards ruling out potential causes and seek odour solutions, as timely as possible.