OPTIONS ABSOLUTE Grain size of material and Land availability and Topography Environmental Impacts Material handling and chemical contamination infrastructure Port of Gladstone LAND Maintenance dredged sediments Land availability is highly constrained due Tidal lands in the vicinity of Gladstone is an industrial city RECLAMATION are predominantly coarse with 54 industrial development. In the Western Gladstone harbour are and handling facilities and (sub-tidal creation per cent of all locations having a Basin there is already a large reclamation generally comprised of either infrastructure are not combined gravel and sand area of 408.5 ha for the disposal of seagrass, fish habitat areas constraints of land) proportion of > 90 per cent (WBM approximately 55 Mm3 of spoil. There are or mangrove habitat and the 2012). Sediments within shallower other possible sites on Curtis Island at entire harbour is a dugong intertidal areas are characterised by Hamilton Point and Laird Point, however, protection zone. Impacts silts and clays. Capital dredged due to the growth of Gladstone these sites relating to water quality sediments are lensed consisting of are under investigation by future LNG associated with de watering fine silts, sands, gravels to stiff clays proponents. The harbour has high would need to be mitigated (GPC pers.comm. 2012).Sediments environmental values and on the eastern against. within Gladstone harbour are clean and western areas have significant seagrass and uncontaminated. There are meadows, fringing mangroves and intertidal some Potential Acid Sulfate Soils in habitats. Areas further north of the present near shore environments. Possible reclamation area have no access (road) and treatment may be required. have high environmental values. There may be possible areas south at South Trees towards Boyne Island and Tannum Sands, however, access any be difficult due to narrow channels. There was a small area to the east (contaminated bunded site) that could be considered for reclamation. CONSTRUCTION Sediments may be suitable for To use the material as construction fill, the Significant impacts on Gladstone is an industrial city
OPTIONS ABSOLUTE Grain size of material and chemical contamination Land availability and Topography Environmental Impacts Material handling and infrastructure Port of Gladstone LAND RECLAMATION (sub-tidal creation of land) Maintenance dredged sediments are predominantly coarse with 54 per cent of all locations having a combined gravel and sand proportion of > 90 per cent (WBM 2012). Sediments within shallower intertidal areas are characterised by silts and clays. Capital dredged sediments are lensed consisting of fine silts, sands, gravels to stiff clays (GPC pers.comm. 2012).Sediments within Gladstone harbour are clean and uncontaminated. There are some Potential Acid Sulfate Soils in near shore environments. Possible treatment may be required. Land availability is highly constrained due industrial development. In the Western Basin there is already a large reclamation area of 408.5 ha for the disposal of approximately 55 Mm3 of spoil. There are other possible sites on Curtis Island at Hamilton Point and Laird Point, however, due to the growth of Gladstone these sites are under investigation by future LNG proponents. The harbour has high environmental values and on the eastern and western areas have significant seagrass meadows, fringing mangroves and intertidal habitats. Areas further north of the present reclamation area have no access (road) and have high environmental values. There may be possible areas south at South Trees towards Boyne Island and Tannum Sands, however, access any be difficult due to narrow channels. There was a small area to the east (contaminated bunded site) that could be considered for reclamation. Tidal lands in the vicinity of Gladstone harbour are generally comprised of either seagrass, fish habitat areas or mangrove habitat and the entire harbour is a dugong protection zone. Impacts relating to water quality associated with de watering would need to be mitigated against. Gladstone is an industrial city and handling facilities and infrastructure are not constraints CONSTRUCTION Sediments may be suitable for To use the material as construction fill, the Significant impacts on Gladstone is an industrial city
gbr-dredge-material-management-appendixa.docx