water and groundwater. Dredged material likely to be largely Beaches requiring erosion control are not Generally environmental If rock is found, existing SHORE devoid of rock material (minimal known to be present in the area. impacts will be manageable, handling areas may be able to CONTROL supply). Rock material (if found) depending on the location of be used for loading and would need to meet engineering works. Design would need to unloading of material. Road guidelines for use. minimise impacts on long access required for transport shore sand migration, turtle of rock to site. nesting beaches and marine plants. BEACH Sediments of Abbot Point are There are no known beaches in the area If appropriate grain sizes are Depending on material, may NOURISHMENT predominantly fine to medium requiring beach nourishment works. used (where available), be able to pump directly from sands, comprising 50 per cent sand impacts will be minimal. vessel to beach site. If double with increasing silt content with Sediments with a high silt handling required and sand depth. Some clay also in deeper and/or clay content must be needs to be separated from areas. Such material is likely to be avoided or environmental clays, then drying ponds and of some value for beach impacts will be high and facilities will be required. nourishment. The material is changes to natural Loading and unloading uncontaminated and may not environmental qualities may machinery for transportation. require treatment for ASS if result. Beaches have high sediment kept underwater. conservation value for nesting turtles and other marine species, unlikely that beach nourishment will be supported.
water and groundwater. SHORE CONTROL Dredged material likely to be largely devoid of rock material (minimal supply). Rock material (if found) would need to meet engineering guidelines for use. Beaches requiring erosion control are not known to be present in the area. 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. If rock is found, existing handling areas may be able to be used for loading and unloading of material. Road access required for transport of rock to site. BEACH NOURISHMENT Sediments of Abbot Point are predominantly fine to medium sands, comprising 50 per cent sand with increasing silt content with depth. Some clay also in deeper areas. Such material is likely to be of some value for beach nourishment. The material is uncontaminated and may not require treatment for ASS if sediment kept underwater. There are no known beaches in the area requiring beach nourishment works. If appropriate grain sizes are used (where available), impacts will be minimal. Sediments with a high silt and/or clay content must be avoided or environmental impacts will be high and changes to natural environmental qualities may result. Beaches have high conservation value for nesting turtles and other marine species, unlikely that beach nourishment will be supported. Depending on material, may be able to pump directly from vessel to beach site. If double handling required and sand needs to be separated from clays, then drying ponds and facilities will be required. Loading and unloading machinery for transportation.
gbr-dredge-material-management-appendixa.docx