reliant on tourism. Transport of dried material to mine sites may also be problematic due to the mountainous terrain of the wet tropics surrounding the port. Drying times in the wet tropics would also be highly constrained and larger areas would therefore be required. SHORE No rock material is present in the The northern beaches may require shore Generally environmental Limited infrastructure currently areas required for maintenance protection, but mainly from sand impacts will be manageable, available. Would depend on CONTROL dredging. The presence of rock in nourishment. No rock material is present in depending on the location of volumes of rock produced and deeper sediments requiring capital dredge sediment. works. Design would need to their need in local projects. dredging is unknown and worth minimise impacts on long Transport of rocks by barge, or further investigation. shore sand migration, turtle road may be possible. Loading nesting beaches and marine and unloading facility or plants. machinery required. BEACH Sediments dredged are unsuitable The northern beaches are a considerable There may be smothering of The material would require NOURISHMENT for beach nourishment purposes distance from the port and too far to pump benthic habitats in the short separation of clean sand, then due to the high silt and clay content. directly from footprint to site. term. Silts and clays must be could either be transport by avoided or impacts will be vessel and pumped to the high. beach or transported by truck. CONSTRUCTION Maintenance dredging material is Dredged material would first need to be Minimal, although sediments Material would need massive unsuitable, due to the fine grain size dewatered and treated prior to use as must first be dewatered, processing and addition of of sediments (clays and silts). Clean construction material. Most land in the which would result in aggregates. Large rehandling sands are required for use as vicinity of the port is used for high density significant impacts to facilities required and transport
reliant on tourism. Transport of dried material to mine sites may also be problematic due to the mountainous terrain of the wet tropics surrounding the port. Drying times in the wet tropics would also be highly constrained and larger areas would therefore be required. SHORE CONTROL No rock material is present in the areas required for maintenance dredging. The presence of rock in deeper sediments requiring capital dredging is unknown and worth further investigation. The northern beaches may require shore protection, but mainly from sand nourishment. No rock material is present in dredge sediment. Generally environmental impacts will be manageable, depending on the location of works. Design would need to minimise impacts on long shore sand migration, turtle nesting beaches and marine plants. Limited infrastructure currently available. Would depend on volumes of rock produced and their need in local projects. Transport of rocks by barge, or road may be possible. Loading and unloading facility or machinery required. BEACH NOURISHMENT Sediments dredged are unsuitable for beach nourishment purposes due to the high silt and clay content. The northern beaches are a considerable distance from the port and too far to pump directly from footprint to site. There may be smothering of benthic habitats in the short term. Silts and clays must be avoided or impacts will be high. The material would require separation of clean sand, then could either be transport by vessel and pumped to the beach or transported by truck. CONSTRUCTION Maintenance dredging material is unsuitable, due to the fine grain size of sediments (clays and silts). Clean sands are required for use as Dredged material would first need to be dewatered and treated prior to use as construction material. Most land in the vicinity of the port is used for high density Minimal, although sediments must first be dewatered, which would result in significant impacts to Material would need massive processing and addition of aggregates. Large rehandling facilities required and transport
gbr-dredge-material-management-appendixa.docx