its salt content. Cairns region dewatered and treated prior to use as fill for terrestrial environmental Transport of dried material, generally has relatively high value agricultural purposes. Most land in the values to clear sufficient land once created would be difficult agricultural soils, of a better quality vicinity of the port is used for high density to dry material prior to by road, would involve large than dredged material (lack of residential purposes, conservation and dredging. Ongoing amounts of rehandling and demand for material). cultural heritage management, forestry discharges of waste water truck movements. There is not purposes or mixed agricultural purposes. during works as part of the de a demand for the product. Accordingly, establishment of a spoil watering process. Infrastructure may be required processing area is highly constrained due to at the farm gate to blend a lack of available land and a growing city, dredged material with in situ reliant on tourism. Drying times in the wet soils. tropics would also be highly constrained and larger areas would therefore be required. HABITAT The potential for ASS present and There is an area east of Trinity Inlet that is Potential for ASS to be Material would need to be RESTORATION/ the high plasticity clay content it is being rehabilitated to restore tidal water present and the wetland have pumped to CREATION unlikely that the dredged material habitat. Lime flushing has been undertaken already been rehabilitated so restoration/development site would make a suitable vegetation to remove the ASS present. This could be a could be more sensitive to using floating pipelines via the growth medium (Golder Associates potential site to use dredge material for impacts from ASS. Removing Trinity Inlet which may pose 2012) further habitat restoration, however, the ASS the bunds could cause a land short term navigational issues potential of the dredged material would need to subside. but not a major constraint. to be addressed.. LANDFILL(capping Due to the fine mud and silt content Springmount waste management (landfill) The potential for ASS would No facilities in place currently. the dredged material would not be facility near Mareeba has 140 ha of land. need to be treated to prevent Dewatering, processing and and blending for beneficial use) suitable for capping of landfill sites. However Mareeba is approximately 40 km any adverse impacts. material handling faculties Potential for ASS to be present west of Cairns. There is also Yungaburra (loading and unloading at waste management facility approximately 40 either end) would be required.
its salt content. Cairns region generally has relatively high value agricultural soils, of a better quality than dredged material (lack of demand for material). dewatered and treated prior to use as fill for agricultural purposes. Most land in the vicinity of the port is used for high density residential purposes, conservation and cultural heritage management, forestry purposes or mixed agricultural purposes. Accordingly, establishment of a spoil processing area is highly constrained due to a lack of available land and a growing city, reliant on tourism. Drying times in the wet tropics would also be highly constrained and larger areas would therefore be required. terrestrial environmental values to clear sufficient land to dry material prior to dredging. Ongoing discharges of waste water during works as part of the de watering process. Transport of dried material, once created would be difficult by road, would involve large amounts of rehandling and truck movements. There is not a demand for the product. Infrastructure may be required at the farm gate to blend dredged material with in situ soils. HABITAT RESTORATION/ CREATION The potential for ASS present and the high plasticity clay content it is unlikely that the dredged material would make a suitable vegetation growth medium (Golder Associates 2012) There is an area east of Trinity Inlet that is being rehabilitated to restore tidal water habitat. Lime flushing has been undertaken to remove the ASS present. This could be a potential site to use dredge material for further habitat restoration, however, the ASS potential of the dredged material would need to be addressed.. Potential for ASS to be present and the wetland have already been rehabilitated so could be more sensitive to impacts from ASS. Removing the bunds could cause a land to subside. Material would need to be pumped to restoration/development site using floating pipelines via the Trinity Inlet which may pose short term navigational issues but not a major constraint. LANDFILL(capping and blending for beneficial use) Due to the fine mud and silt content the dredged material would not be suitable for capping of landfill sites. Potential for ASS to be present Springmount waste management (landfill) facility near Mareeba has 140 ha of land. However Mareeba is approximately 40 km west of Cairns. There is also Yungaburra waste management facility approximately 40 The potential for ASS would need to be treated to prevent any adverse impacts. No facilities in place currently. Dewatering, processing and material handling faculties (loading and unloading at either end) would be required.
gbr-dredge-material-management-appendixa.docx