at Tug Harbour. Clays and silts need to de-watered. Drying ponds required for dewatering of Significant impacts on No facilities in place currently. MINE REHABILITATION The material would not be suitable material. Land availability in Hay Point and terrestrial environmental Drying areas and associated as capping fill for engineered Dudgeon Point is highly constrained due to values to clear sufficient land facilities would need to be purposes (load bearing) due to the environmental values and existing or to dry material prior to constructed. Transport of dried high silt content and may require proposed uses. Only small sections of flat dredging. Ongoing material, once created may be washing to remove salt. The land are available, but these are too small to discharges of waste water by road or rail and would material is not contaminated and accommodate the volumes of material during works as part of the de involve large amounts of would not need further processing required. watering process. rehandling and truck other than some liming to reduce movements. It is not minor ASS levels as determined by technically feasible to pump testing. the dredge material 12-14 km to shore. SHORE Only the rock component of dredge Given the likely small quantities of rock, land Generally environmental Limited infrastructure currently material has the potential to be availability may not be a large constraint. impacts will be manageable, available. Would depend on CONTROL suitable, however, the rock is Local need for shore protection structures depending on the location of volumes of rock produced and weathered and does not meet would also be required, such as the Tug works. Design would need to their need in local projects. appropriate engineering standards. Harbour expansion. minimise impacts on long Rock material unloaded Sands, silts and clays unsuitable. shore sand migration, turtle directly from vessel to shore nesting beaches and marine best scenario. Transport of plants. rocks by road or rail possible in small quantities. BEACH Material not suitable due to high silt Local beaches tend to have relatively high Use of silts and clays will N/A environmental values and may not require negatively impact beach
at Tug Harbour. MINE REHABILITATION Clays and silts need to de-watered. The material would not be suitable as capping fill for engineered purposes (load bearing) due to the high silt content and may require washing to remove salt. The material is not contaminated and would not need further processing other than some liming to reduce minor ASS levels as determined by testing. Drying ponds required for dewatering of material. Land availability in Hay Point and Dudgeon Point is highly constrained due to environmental values and existing or proposed uses. Only small sections of flat land are available, but these are too small to accommodate the volumes of material required. Significant impacts on 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. No facilities in place currently. Drying areas and associated facilities would need to be constructed. Transport of dried material, once created may be by road or rail and would involve large amounts of rehandling and truck movements. It is not technically feasible to pump the dredge material 12-14 km to shore. SHORE CONTROL Only the rock component of dredge material has the potential to be suitable, however, the rock is weathered and does not meet appropriate engineering standards. Sands, silts and clays unsuitable. Given the likely small quantities of rock, land availability may not be a large constraint. Local need for shore protection structures would also be required, such as the Tug Harbour expansion. 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. Rock material unloaded directly from vessel to shore best scenario. Transport of rocks by road or rail possible in small quantities. BEACH Material not suitable due to high silt Local beaches tend to have relatively high environmental values and may not require Use of silts and clays will negatively impact beach N/A
gbr-dredge-material-management-appendixa.docx