Lake Brearley dredging completed

The eight-week dredging program has now been completed, and the contractor has demobilised from site. It is estimated that the contractor was able to dredge >90% of the target area. Given the operational uncertainties associated with the project, such as dredge access, anchor point locations and pumping distances, achieving that level of coverage is considered a good result. Based on the experience from dredging Lake Bungana, it could take approximately 18 months for the dredging in Lake Brearley to improve water quality and clarity.

Power has been reconnected to the mechanical mixer and the solar powered ultrasonics returned to optimal locations last week. Post-dredging sediment sampling will be undertaken to verify the effectiveness of the dredging program at removing the nutrient rich sediment. Fencing will be realigned this week to enable residents to access the path adjacent to Lake Brearley but keeping the sediment bags secure while they dry which is anticipated to take 4 - 6 weeks. Once the sediment is sufficiently dry the bags and limestone pad will be removed and the grass and reticulation reinstated. While the lake has been fenced off City officers have taken the opportunity to plant approximately 400 sedges along the limestone walls, adjacent to Tourer Court and at Hinkler Loop. This planting will contribute to improving biodiversity in the lake and nutrient removal. City officers will continue monitoring of the water quality and midge levels to assist in understanding the effectiveness of actions taken to date.