machinery. and infrastructure required. de-neutralise. Material may need washing to remove salt content. Rock generally used for hard Material used must have high Dependent on volume of Contaminated material may be SHORE structures. Sand and gravel geotechnical properties, such material needed for project. used but will be capped and PROTECTION/EROSION may be used behind the as rock, to withstand coastal contained by other material to CONTROL seawall to fill area. conditions and storm surge. prevent leaching to surrounding marine environment. Sand and gravel grain size. Sand content > 80 per cent. Volume of sand depends on Sand must be clean and not BEACH NOURISHMENT Donor and recipient must be size of beach and amount of contaminated. similar in nature. Sand content sand required to inhibit future > 80 per cent. erosion. Any material can be suitable Variety of materials can be Dependent on local demand Dredged rock is most suitable CONSTRUCTION dependent on product used, however, geotechnical for material and facilities and is generally not MATERIAL demand. Fine silts and clays properties must be high. where material will be contaminated. Contaminated have to be mixed with cement. Materials may need to be processed and stored. material may need to be Rock and sand is the most mixed with additives to form dewatered and washed prior suitable material. suitable aggregate. to use. Any material suitable however, Material must able to dry out Only small volumes due to Low level contaminated soils PARKS and sand and gravel most suitable within sufficient time frame. processing of material preferable. Highly RECREATION (fill
machinery. and infrastructure required. de-neutralise. Material may need washing to remove salt content. SHORE PROTECTION/EROSION CONTROL Rock generally used for hard structures. Sand and gravel may be used behind the seawall to fill area. Material used must have high geotechnical properties, such as rock, to withstand coastal conditions and storm surge. Dependent on volume of material needed for project. Contaminated material may be used but will be capped and contained by other material to prevent leaching to surrounding marine environment. BEACH NOURISHMENT Sand and gravel grain size. Donor and recipient must be similar in nature. Sand content > 80 per cent. Sand content > 80 per cent. Volume of sand depends on size of beach and amount of sand required to inhibit future erosion. Sand must be clean and not contaminated. CONSTRUCTION MATERIAL Any material can be suitable dependent on product demand. Fine silts and clays have to be mixed with cement. Rock and sand is the most suitable material. Variety of materials can be used, however, geotechnical properties must be high. Materials may need to be mixed with additives to form suitable aggregate. Dependent on local demand for material and facilities where material will be processed and stored. Dredged rock is most suitable and is generally not contaminated. Contaminated material may need to be dewatered and washed prior to use. PARKS and RECREATION (fill Any material suitable however, sand and gravel most suitable Material must able to dry out within sufficient time frame. Only small volumes due to processing of material Low level contaminated soils preferable. Highly
gbr-dredge-material-management-appendixa.docx