Posted on June 21, 2018
By Ian Ackerman, DCN
Maintenance dredging at Fremantle’s Success and Parmelia channels is due to commence later this month.
According to a statement from the Port of Fremantle, the campaign is to remove about 80,000 cubic metres of sediment from five areas in the channels.
This dredging project is part of the Port’s long-term maintenance dredging strategy, approved by the Environmental Protection Authority in 2007.
The RN Dredging Pty Ltd trailer suction hopper dredge, Modi-R, is to be mobilised for the dredging.
Dredging overflow is discharged under the vessel and features a ‘green valve’, which reduces air discharged with overflow water, resulting in sediments and fines sinking to the seabed and reducing turbidity.
One maintenance dredging load will be undertaken every 24 hours, removing approximately 1,000 cubic metres on every dredge path run.
The maintenance dredging campaign will last for three to four months.
Mod-R is also contracted by Cockburn Cement Ltd (CCL) and the maintenance dredging will not be additional to CCL’s current dredging; instead, one trip to the CCL dredge area will be substituted with a maintenance site within the channels.
Dredged sediment will be deposited directly at the CCL washplant and used for the production of cement and lime, rather than being disposed of offshore.
Source: DCN
